Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Narrative) (Details)

v3.23.2
Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2023
Jan. 01, 2022
Aug. 29, 2020
Jun. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Jun. 13, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common Stock, shares authorized       200,000,000 200,000,000     200,000,000   200,000,000  
Stock-based compensation expense         $ 4,217   $ 5,081 $ 8,948 $ 10,644    
Stock options, unrecognized compensation expense       $ 600 600     600      
Exercise price of warrants                     $ 0.5424
Change in fair value of Warrant liabilities         512     (6,166)      
Journey                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense         $ 873   774 $ 1,519 1,548    
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                
2007 and 2013 Stock Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock based compensation, shares available for issuance       7,300,000 7,300,000     7,300,000      
2013 Stock Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share based compensation, additional shares authorized       7,000,000.0              
2012 Employee Stock Purchase Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock based compensation, number of shares authorized       29,000,000.0 29,000,000.0     29,000,000.0      
Share based compensation, additional shares authorized       1,000,000.0              
Long-term Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense         $ 1,500   1,300 $ 2,900 2,600    
Fair value of stock granted               800   $ 1,000  
LTIP, Percentage of outstanding shares 1.00% 1.00%                  
Maximum | Oaktree Note [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Warrants issued     1,749,450                
Chief Executive Officer (Dr. Rosenwald) [Member] | Long-term Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares Granted 1,219,294 1,219,294                  
Executive Vice President (Mr. Weiss) [Member] | Long-term Incentive Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares Granted 1,102,986 1,102,986                  
Research and Development Expense [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense         500 $ 1,200   1,500 2,600    
General and Administrative Expense [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense         3,700   3,900 7,500 8,100    
Interest Expense [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Change in fair value of Warrant liabilities               300      
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       $ 16,000 $ 16,000   $ 24,500 $ 16,000 $ 24,500    
Share-based compensation, period for recognition of expense               2 years 2 years 3 months 18 days    
Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares Granted               2,578,588      
Restricted Stock Units (RSUs) [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares Granted               190,000