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Condensed Consolidated Statements of Stockholders’ Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive (Loss) Income
Beginning balance (in shares) at Dec. 31, 2022   4,830,464      
Beginning balance at Dec. 31, 2022 $ 46,552 $ 48 $ 1,195,687 $ (1,148,997) $ (186)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 1,395   1,395    
Issuance of common stock under employee benefit plans (in shares)   516      
Issuance of common stock under employee benefit plans 8 $ 1 7    
Unrealized gain on marketable securities 195       195
Net loss (11,559)     (11,559)  
Ending balance (in shares) at Mar. 31, 2023   4,830,980      
Ending balance at Mar. 31, 2023 $ 36,591 $ 49 1,197,089 (1,160,556) 9
Beginning balance (in shares) at Dec. 31, 2023 5,894,085 5,894,085      
Beginning balance at Dec. 31, 2023 $ 19,670 $ 59 1,215,792 (1,196,410) 229
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 1,559   1,559    
Unrealized gain on marketable securities 109       109
Net loss $ (11,876)     (11,876)  
Ending balance (in shares) at Mar. 31, 2024 5,894,085 5,894,085      
Ending balance at Mar. 31, 2024 $ 9,462 $ 59 $ 1,217,351 $ (1,208,286) $ 338