Stockholders' Equity (Capital Raise) (Narrative) (Details) - USD ($)
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1 Months Ended |
3 Months Ended |
12 Months Ended |
Oct. 23, 2020 |
Aug. 28, 2020 |
Aug. 26, 2020 |
Jun. 11, 2020 |
May 09, 2020 |
Feb. 14, 2020 |
Aug. 16, 2019 |
Jul. 13, 2018 |
Dec. 01, 2016 |
Nov. 30, 2020 |
Sep. 30, 2020 |
Nov. 30, 2019 |
Apr. 30, 2019 |
Nov. 30, 2017 |
Sep. 30, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, aggregate fees paid |
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$ 1,658,000
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$ 427,000
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| Preferred Stock, liquidation preference per share |
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$ 25.00
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$ 25.00
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| Common Stock [Member] | MLV & Co. and FBR Capital Markets & Co [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, price per share |
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$ 1.88
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| Series A Preferred Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, number of shares issued |
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0
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| Preferred Stock, dividend rate percentage |
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9.375%
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| Preferred Stock, liquidation preference per share |
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$ 25.00
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| Cyprium [Member] | Series A Preferred Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Preferred Stock, dividend rate percentage |
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9.375%
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| Preferred Stock, dividend per share |
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$ 0.19531
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| Preferred stock, dividend paid |
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$ 49,883
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$ 200,000
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| Mustang [Member] | Common Stock [Member] | Cantor Fitzgerald & Co [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, number of shares issued |
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10,769,231
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| Option to purchase additional shares, exercised |
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686,373
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| Option to purchase additional number of shares |
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1,615,384
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| Stock offering, price per share |
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$ 3.25
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| Stock offering, gross proceeds |
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$ 37,200,000
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| Sale of stock, net proceeds |
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34,800,000
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| Stock offering, aggregate fees paid |
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$ 2,400,000
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| At the Market Offering [Member] | Common Stock [Member] | MLV & Co. and FBR Capital Markets & Co [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, number of shares issued |
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8,000,000.0
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| Stock offering, gross proceeds |
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$ 15,100,000
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| Stock offering, aggregate fees paid |
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$ 300,000
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| Stock offering, sales agreement termination date |
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Aug. 17, 2019
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| At the Market Offering [Member] | Common Stock [Member] | Cantor Fitzgerald & Co., Oppenheimer & Co., Inc., H.C. Wainwright & Co. Inc., Jones Trading Institutional Services LLC and B. Riley [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, number of shares issued |
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17,400,000
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3,800,000
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| Stock offering, price per share |
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$ 2.73
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$ 1.49
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| Stock offering, gross proceeds |
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$ 47,500,000
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$ 5,600,000
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| Stock offering, aggregate fees paid |
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$ 1,400,000
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$ 200,000
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| At the Market Offering [Member] | Series A Preferred Stock [Member] | B. Riley, National Securities Corporation, LifeSci Capital LLC, Maxim Group LLC and Noble Capital Markets, Inc [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, number of shares issued |
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39,292
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| Stock offering, price per share |
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$ 20.67
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| Stock offering, gross proceeds |
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$ 800,000
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| Stock offering, aggregate fees paid |
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$ 24,000
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| Stock offering, sales agreement termination date |
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Dec. 01, 2019
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| At the Market Offering [Member] | Mustang [Member] | Common Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, number of shares issued |
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17,600,000
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3,500,000
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| Stock offering, price per share |
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$ 3.40
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$ 6.42
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| Stock offering, gross proceeds |
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$ 59,800,000
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$ 22,500,000
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| Sale of stock, net proceeds |
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58,700,000
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22,000,000.0
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| Stock offering, aggregate fees paid |
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1,100,000
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$ 500,000
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| At the Market Offering [Member] | Maximum [Member] | Common Stock [Member] | MLV & Co. and FBR Capital Markets & Co [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, aggregate offering permitted by the agreement |
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$ 53,000,000.0
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| At the Market Offering [Member] | Maximum [Member] | Common Stock [Member] | Cantor Fitzgerald & Co., Oppenheimer & Co., Inc., H.C. Wainwright & Co. Inc., Jones Trading Institutional Services LLC and B. Riley [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, commission rate |
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3.00%
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| At the Market Offering [Member] | Maximum [Member] | Series A Preferred Stock [Member] | B. Riley, National Securities Corporation, LifeSci Capital LLC, Maxim Group LLC and Noble Capital Markets, Inc [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, commission rate |
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7.00%
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| Public Offering [Member] | Series A Preferred Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, number of shares issued |
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666,666
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555,556
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625,000
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262,500
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| Option to purchase additional shares, exercised |
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39,375
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| Option to purchase additional number of shares |
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66,666
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83,333
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93,750
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| Stock offering, price per share |
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$ 18.00
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$ 18.00
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$ 20.00
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$ 20
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| Stock offering, gross proceeds |
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$ 13,200,000
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$ 11,500,000
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$ 14,400,000
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$ 6,000,000.0
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| Stock offering, aggregate fees paid |
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$ 1,100,000
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$ 1,100,000
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$ 1,300,000
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| Public Offering [Member] | Cyprium [Member] | Series A Preferred Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, number of shares issued |
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255,400
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| Option to purchase additional number of shares |
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64,600
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| Stock offering, price per share |
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$ 25.00
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| Stock offering, gross proceeds |
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$ 8,000,000.0
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| Stock offering, aggregate fees paid |
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$ 900,000
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| Preferred Stock, liquidation preference per share |
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$ 25.00
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| Public Offering [Member] | Cyprium [Member] | Series A Preferred Stock [Member] | Annual Dividend [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Preferred Stock, dividend per share |
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2.34375
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| Public Offering [Member] | Cyprium [Member] | Series A Preferred Stock [Member] | Monthly Dividend [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Preferred Stock, dividend per share |
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$ 0.19531
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| Public Offering [Member] | Checkpoint [Member] | Common Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, number of shares issued |
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7,321,429
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15,400,000
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| Stock offering, price per share |
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$ 2.80
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$ 1.27
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$ 2.80
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| Stock offering, gross proceeds |
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$ 20,500,000
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$ 19,600,000
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| Sale of stock, net proceeds |
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18,900,000
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17,600,000
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| Stock offering, aggregate fees paid |
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$ 1,600,000
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$ 2,000,000.0
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| Public Offering [Member] | Mustang [Member] | Common Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, number of shares issued |
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6,875,000
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| Option to purchase additional number of shares |
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1,031,250
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| Stock offering, price per share |
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$ 4.00
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| Stock offering, gross proceeds |
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$ 31,600,000
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| Sale of stock, net proceeds |
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$ 29,500,000
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| Stock offering, aggregate fees paid |
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2,100,000
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| Shelf Registration Statement [Member] | Common Stock [Member] | Cantor Fitzgerald & Co., Oppenheimer & Co., Inc., H.C. Wainwright & Co. Inc., Jones Trading Institutional Services LLC and B. Riley [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Amount available for future stock offerings |
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$ 26,700,000
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| Shelf Registration Statement [Member] | Checkpoint [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock offering, commission rate |
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3.00%
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| Shelf Registration Statement [Member] | Checkpoint [Member] | Common Stock [Member] |
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|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Stock offering, number of shares issued |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5,104,234
|
2,273,189
|
|
| Stock offering, price per share |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 2.50
|
$ 3.52
|
|
| Stock offering, gross proceeds |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 12,800,000
|
$ 8,000,000.0
|
|
| Sale of stock, net proceeds |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
12,400,000
|
$ 7,800,000
|
|
| Amount available for future stock offerings |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
83,600,000
|
|
|
| Shelf Registration Statement [Member] | Mustang [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Stock offering, aggregate offering permitted by the agreement |
$ 100,000,000.0
|
|
|
|
|
|
$ 75,000,000.0
|
$ 75,000,000.0
|
|
|
|
|
|
|
|
$ 85,700,000
|
|
|
| Stock offering, commission rate |
|
|
|
|
|
|
|
3.00%
|
|
|
|
|
|
|
|
|
|
|
| Shelf Registration Statement [Member] | Maximum [Member] | Checkpoint [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Stock offering, aggregate offering permitted by the agreement |
|
|
|
|
|
|
|
|
|
$ 100,000,000
|
|
|
|
|
|
|
|
|
| Shelf Registration Statement [Member] | Maximum [Member] | Checkpoint [Member] | Common Stock [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Stock offering, aggregate offering permitted by the agreement |
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 100,000,000
|
|
|
|
|
| Stock offering, commission rate |
|
|
|
|
|
|
|
|
|
|
|
|
|
3.00%
|
|
|
|
|