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Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance at Dec. 31, 2022 $ 13,572 $ 1,191 $ 1,807,855 $ (19) $ (1,795,455)
Balance (in shares) at Dec. 31, 2022   119,155      
Issuance of common stock under equity incentive plan (208) $ 2 (210)    
Issuance of common stock under equity incentive plan (in shares)   125      
Stock-based compensation expense 7,947   7,947    
Net loss (32,768)       (32,768)
Net unrealized gains (losses) on short-term investments 28     28  
Comprehensive loss (32,740)        
Balance at Mar. 31, 2023 (11,429) $ 1,193 1,815,592 9 (1,828,223)
Balance (in shares) at Mar. 31, 2023   119,280      
Balance at Dec. 31, 2023 (33,973) $ 1,503 1,870,525 13 (1,906,014)
Balance (in shares) at Dec. 31, 2023   150,285      
Issuance of common stock under equity incentive plan 11 $ 1 10    
Issuance of common stock under equity incentive plan (in shares)   93      
Stock-based compensation expense 3,375   3,375    
Net loss (3,160)       (3,160)
Net unrealized gains (losses) on short-term investments (19)     (19)  
Comprehensive loss (3,179)        
Balance at Mar. 31, 2024 $ (33,766) $ 1,504 $ 1,873,910 $ (6) $ (1,909,174)
Balance (in shares) at Mar. 31, 2024   150,378