Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Narrative) (Details)

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Stockholders' Equity (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2024
Jan. 01, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 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
Stock-based compensation expense     $ 4,998 $ 4,217 $ 9,856 $ 8,948  
Stock options, unrecognized compensation expense     600 600 600 600  
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     $ 1,674 873 $ 3,080 1,519  
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     10,000,000.0   10,000,000.0    
2013 Stock Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based compensation, additional shares authorized         10,000,000.0    
2012 Employee Stock Purchase Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share based compensation, additional shares authorized         1,000,000.0    
Long-term Incentive Plans [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense     $ 1,700 1,500 $ 3,300 2,900  
Fair value of stock granted         700   $ 800
LTIP, Percentage of outstanding shares 1.00% 1.00%          
Chief Executive Officer (Dr. Rosenwald) [Member] | Long-term Incentive Plans [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares Granted 216,465 216,465          
Executive Vice President (Mr. Weiss) [Member] | Long-term Incentive Plans [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares Granted 216,465 216,465          
Research and Development Expense [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense     700 500 1,700 1,500  
General and Administrative Expense [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense     4,300 3,700 $ 8,100 $ 7,500  
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation, period for recognition of expense         3 years 7 months 6 days 5 years 8 months 12 days  
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     $ 11,500 $ 16,000 $ 11,500 $ 16,000  
Share-based compensation, period for recognition of expense         1 year 3 months 18 days 2 years  
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares Granted         443,024    
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares Granted         37,500