Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Narrative) (Details)

v3.22.2
Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 21, 2022
Aug. 29, 2020
Jun. 30, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock, increase (decrease) in shares authorized 30,000,000              
Common Stock, shares authorized     200,000,000 200,000,000   200,000,000   170,000,000
Stock-based compensation expense       $ 5,081 $ 4,350 $ 10,644 $ 8,123  
Stock options, unrecognized compensation expense     $ 0 0   0    
Journey [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense       $ 774 11 $ 1,547 33  
Oaktree Note [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Exercise price of warrants   $ 3.20            
Percentage of market price of common stock for additional warrants   95.00%            
Warrants expiration date   Aug. 27, 2030            
2013 Stock Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common stock, increase (decrease) in shares authorized     3,000,000.0          
Common Stock, shares authorized     16,000,000.0 16,000,000.0   16,000,000.0    
Number of shares available for future issuance     4,598,395 4,598,395   4,598,395    
Maximum [Member] | Oaktree Note [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   1,749,450            
Research and Development Expense [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense       $ 1,200 800 $ 2,600 2,000  
General and Administrative Expense [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense       3,900 3,600 8,100 6,100  
Restricted Stock Awards and Restricted Stock Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation expense for awards other than options     $ 24,500 $ 24,500 $ 23,500 $ 24,500 $ 23,500  
Share-based compensation, period for recognition of expense           2 years 3 months 18 days 3 years 2 months 12 days  
Restricted Stock [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares Granted           2,375,972    
Restricted Stock Units (RSUs) [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares Granted           535,602