Annual report pursuant to Section 13 and 15(d)

Debt and Interest (2018 Venture Notes and Mustang Horizon Notes) (Narrative) (Details)

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Debt and Interest (2018 Venture Notes and Mustang Horizon Notes) (Narrative) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Mar. 29, 2019
USD ($)
$ / shares
shares
Mar. 29, 2019
USD ($)
installment
$ / shares
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]              
Debt maturity date         Sep. 14, 2018    
Cash balance         $ 13,000,000.0    
Total notes payable, gross         60,000,000 $ 89,742,000  
Debt instrument, accrued interest         $ 9,704,000 8,528,000  
LIBOR Rate [Member]              
Debt Instrument [Line Items]              
Basis spread on variable rate         2.50%    
2018 Venture Notes [Member]              
Debt Instrument [Line Items]              
Payment of debt issuance fees         $ 58,000 134,000  
Proceeds from Notes           2,000,000.0  
Debt repayment terms             will be repaid at the rate of 1/12 of the principal amount per month for a period of 12 months. Interest on the note is 8% payable quarterly during the first 24 months (or the first 30 months if the note is extended) and monthly during the last 12 months
Debt instrument, stated interest rate             8.00%
Total notes payable, gross         0 21,700,000  
Repayments of debt         21,707,000 0  
Debt instrument, accrued interest         $ 1,253,000 1,737,000  
2018 Venture Notes [Member] | National Securities Corporation ("NSC") [Member]              
Debt Instrument [Line Items]              
Warrant expiration term         10 years    
Warrant on Sale Price of Note Percentage         25.00%    
2018 Venture Notes [Member] | Promissory Note [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity             $ 21,700,000
Proceeds from Notes             21,700,000
2018 Venture Notes [Member] | Promissory Note [Member] | National Securities Corporation ("NSC") [Member]              
Debt Instrument [Line Items]              
Payment of debt issuance fees       $ 1,700,000      
Venture Note One [Member]              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate         8.00%    
Total notes payable, gross         $ 0 6,517,000  
Venture Note Two [Member]              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate         8.00%    
Total notes payable, gross         $ 0 15,190,000  
Mustang Horizon Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Term   42 months          
Payment of debt issuance fees         $ 0 1,393,000  
Warrant expiration term   10 years 10 years        
Warrants Not Settleable in Cash, Fair Value Disclosure   $ 900,000 $ 900,000        
Debt maturity date   Oct. 01, 2022          
Commitment fee amount   $ 200,000          
Percentage of Warrants Included in Debt   5.00%          
Reimbursement of Legal Fees   $ 30,000          
Maximum borrowing capacity   20,000,000.0 20,000,000.0        
Remaining borrowing capacity   5,000,000.0 5,000,000.0        
Legal fees   1,200,000          
Debt instrument face amount   $ 15,000,000.0 $ 15,000,000.0        
Debt instrument, stated interest rate         9.00%    
Amortization payments, installments | installment     18        
Percent of Outstanding Loan Principal Amount for Calculation of Repayment Change     4.00%        
Percentage Of Amortization Loan Date     3.00%        
Exercise price of warrants | $ / shares   $ 3.47 $ 3.47        
Number of shares called by warrants | shares   288,184 288,184        
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   2.00% 2.00%        
Additional Rate Of Accrued Interest Percentage     5.00%        
Debt redemption, prepayment of debt amount   $ 250,000          
Debt Prepayment Penalties $ 600,000       $ 600,000    
Final payment fee 800,000            
Total notes payable, gross         0 15,750,000  
Repayments of debt 15,000,000.0       15,750,000 0  
Debt instrument, accrued interest $ 100,000       $ 1,585,000 $ 1,042,000  
Mustang Horizon Notes [Member] | LIBOR Rate [Member]              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate           9.00%  
Basis spread on variable rate           2.50%  
Tamid [Member] | 2018 Venture Notes [Member]              
Debt Instrument [Line Items]              
Proceeds from Notes           $ 1,600,000  
Aevitas [Member] | 2018 Venture Notes [Member]              
Debt Instrument [Line Items]              
Proceeds from Notes           3,800,000  
Cyprium [Member] | 2018 Venture Notes [Member]              
Debt Instrument [Line Items]              
Proceeds from Notes           $ 2,200,000  
Maximum [Member] | Mustang Horizon Notes [Member]              
Debt Instrument [Line Items]              
Cash balance   13,000,000 $ 13,000,000        
Minimum [Member] | Mustang Horizon Notes [Member]              
Debt Instrument [Line Items]              
Cash balance   $ 8,000,000 $ 8,000,000        
First 24 Months the Company May Extend the Maturity Date by Six Months [Member] | 2018 Venture Notes [Member]              
Debt Instrument [Line Items]              
Principal payment due             $ 0
First 24 Months the Company May Extend the Maturity Date by Six Months [Member] | 2018 Venture Notes [Member] | Promissory Note [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Term             36 months
LIBOR Rate Exceeds 2.50% [Member] | Mustang Horizon Notes [Member] | LIBOR Rate [Member]              
Debt Instrument [Line Items]              
Debt instrument, stated interest rate   9.00% 9.00%        
Prepayment charge of 4.0% [Member] | Mustang Horizon Notes [Member]              
Debt Instrument [Line Items]              
Debt redemption, prepayment of debt amount     $ 500,000        
Final Payment [Member] | Mustang Horizon Notes [Member]              
Debt Instrument [Line Items]              
Debt redemption, prepayment of debt amount     250,000        
Aggregate Final Payment [Member] | Mustang Horizon Notes [Member]              
Debt Instrument [Line Items]              
Principal payment due     $ 750,000