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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Series A, B, C and D Convertible Preferred Stock [Member]
Common Stock [Member]
Common Stock [Member]
Restricted Stock Units (RSUs) [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balances at Dec. 31, 2021 $ 88,289 $ 3 $ 32   $ 455,719 $ (367,463) $ (2)
Balances, Shares at Dec. 31, 2021   3,218,152 32,393,738        
Issuance of common stock upon the exercise of stock options 419       419    
Issuance of common stock upon the exercise of stock options, shares     56,120        
Issuance of common stock, net of issuance costs 4,203   $ 1   4,202    
Issuance of common stock, net of issuance costs, shares     737,619        
Conversion of convertible preferred stock to common stock 1 $ (1) $ 2        
Conversion of convertible preferred stock to common stock, shares   (942,938) 1,880,000        
Share-based compensation expense 4,520       4,520    
Unrealized loss on available-for-sale securities 2           2
Net loss (61,511)         (61,511)  
Balances at Jun. 30, 2022 35,923 $ 2 $ 35   464,860 (428,974)  
Balances, Shares at Jun. 30, 2022   2,275,214 35,067,477        
Balances at Mar. 31, 2022 62,473 $ 3 $ 33   462,735 (400,292) (6)
Balances, Shares at Mar. 31, 2022   3,218,152 32,755,559        
Issuance of common stock upon the exercise of stock options 231       231    
Issuance of common stock upon the exercise of stock options, shares     38,504        
Issuance of common stock, net of issuance costs 577       577    
Issuance of common stock, net of issuance costs, shares     393,414        
Conversion of convertible preferred stock to common stock 1 $ (1) $ 2        
Conversion of convertible preferred stock to common stock, shares   (942,938) 1,880,000        
Share-based compensation expense 1,317       1,317    
Unrealized loss on available-for-sale securities 6           $ 6
Net loss (28,682)         (28,682)  
Balances at Jun. 30, 2022 35,923 $ 2 $ 35   464,860 (428,974)  
Balances, Shares at Jun. 30, 2022   2,275,214 35,067,477        
Balances at Dec. 31, 2022 $ 75,934   $ 52   489,760 (413,878)  
Balances, Shares at Dec. 31, 2022   0 52,456,195        
Issuance of common stock upon the exercise of stock options, shares 0            
Issuance of common stock upon the vesting of restricted stock units       $ 1      
Issuance of common stock upon the vesting of restricted stock units, shares 1     115,618      
Share-based compensation expense $ 4,027       4,027    
Unrealized loss on available-for-sale securities 0            
Net loss (25,180)         (25,180)  
Balances at Jun. 30, 2023 54,782   $ 53   493,787 (439,058)  
Balances, Shares at Jun. 30, 2023     52,571,813        
Balances at Mar. 31, 2023 64,839   $ 53   491,930 (427,144)  
Balances, Shares at Mar. 31, 2023   0 52,571,813        
Issuance of common stock upon the vesting of restricted stock units 0     $ 0      
Share-based compensation expense 1,857       1,857    
Unrealized loss on available-for-sale securities 0            
Net loss (11,914)         (11,914)  
Balances at Jun. 30, 2023 $ 54,782   $ 53   $ 493,787 $ (439,058)  
Balances, Shares at Jun. 30, 2023     52,571,813