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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
Beginning balance (in shares) at Dec. 31, 2022   166,793,320      
Beginning balance at Dec. 31, 2022 $ 294,958 $ 1,668 $ 1,450,239 $ (1,148,545) $ (8,404)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock, net of offering expenses (in shares)   3,962,430      
Issuance of common stock, net of offering expenses 9,705 $ 40 9,665    
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of tax (in shares)   1,015,818      
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of tax (1,109) $ 10 (1,119)    
Stock-based compensation 8,277   8,277    
Foreign currency translation adjustment 2,045       2,045
Net pension gain (losses) (3)       (3)
Net unrealized (loss) gain on marketable securities, net of tax 604       604
Net (loss) income 21,133     21,133  
Ending balance (in shares) at Mar. 31, 2023   171,771,568      
Ending balance at Mar. 31, 2023 335,610 $ 1,718 1,467,062 (1,127,412) (5,758)
Beginning balance (in shares) at Dec. 31, 2023   178,133,548      
Beginning balance at Dec. 31, 2023 82,887 $ 1,781 1,492,077 (1,406,376) (4,595)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock, net of offering expenses (in shares)   24,761,905      
Issuance of common stock, net of offering expenses 21,788 $ 248 21,540    
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of tax (in shares)   790,633      
Issuance of common stock upon exercise of stock options and vesting of restricted stock units, net of tax (402) $ 8 (410)    
Stock-based compensation 2,719   2,719    
Foreign currency translation adjustment (980)       (980)
Net pension gain (losses) 7       7
Net unrealized (loss) gain on marketable securities, net of tax (233)       (233)
Net (loss) income (49,089)     (49,089)  
Ending balance (in shares) at Mar. 31, 2024   203,686,086      
Ending balance at Mar. 31, 2024 $ 56,697 $ 2,037 $ 1,515,926 $ (1,455,465) $ (5,801)