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 12 Months Ended
Jan. 01, 2024
Jan. 01, 2023
Mar. 31, 2024
Mar. 31, 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
Stock-based compensation expense     $ 4,857 $ 4,731  
Stock options, unrecognized compensation expense     400    
Change in fair value of Warrant liabilities     667 (6,678)  
Journey          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense     $ 1,406 646  
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     38,000,000    
Long-term Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense     $ 1,700 1,400  
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 Plan [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 Plan [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     1,100 900  
General and Administrative Expense [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense     3,700 3,800  
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     $ 13,200 $ 19,600  
Share-based compensation, period for recognition of expense     1 year 4 months 24 days 2 years 1 month 6 days  
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares Granted     444,261