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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Preferred Stock
Additional Paid-in Capital
Accumulated Other Comprehensive (Loss) Income
Accumulated Deficit
Beginning Balances at Dec. 31, 2020 $ 58,693 $ 110 $ 0 $ 1,352,374 $ 273 $ (1,294,064)
Beginning Balances (in shares) at Dec. 31, 2020   110,190,000 4,000      
Issuance of common stock upon exercise of stock options and restricted stock awards, net 387     387    
Issuance of common upon exercise of stock options and restricted stock awards, net (in shares)   640,000        
Issuance of common stock upon exercise of warrants (Shares)   750,000        
Issuance of common stock upon exercise of warrants 7,928 $ 1   7,927    
Issuance of common stock under Employee Stock Purchase Plan 383     383    
Issuance of common stock under Employee Stock Purchase Plan (in shares)   104,000        
Issuance of common stock, net of issuance costs, in conjunction with an underwritten public offering and an At Market Sales Agreement 28,156 $ 3   28,153    
Issuance of common stock, net of issuance costs, in conjunction with an underwritten public offering and an At Market Sales Agreement (Shares)   2,879,000        
Stock compensation expense 4,723     4,723    
Total other comprehensive income (Loss) (1,399)       (1,399)  
Net income 891         891
Ending Balances at Mar. 31, 2021 99,762 $ 114 $ 0 1,393,947 (1,126) (1,293,173)
Ending Balances (in shares) at Mar. 31, 2021   114,563,000 4,000      
Beginning Balances at Dec. 31, 2021 222,374 $ 123 $ 0 1,441,868 (2,266) (1,217,351)
Beginning Balances (in shares) at Dec. 31, 2021   122,945,000 0      
Issuance of common stock upon exercise of stock options and restricted stock awards, net 1,122 $ 1   1,121    
Issuance of common upon exercise of stock options and restricted stock awards, net (in shares)   1,391,000        
Issuance of common stock upon exercise of warrants (Shares)   1,879,000        
Issuance of common stock upon exercise of warrants 24,670 $ 2   24,668    
Issuance of common stock under Employee Stock Purchase Plan 710     710    
Issuance of common stock under Employee Stock Purchase Plan (in shares)   82,000        
Stock compensation expense 7,646     7,646    
Total other comprehensive income (Loss) (1,897)       (1,897)  
Net income 32,859         32,859
Ending Balances at Mar. 31, 2022 $ 287,484 $ 126 $ 0 $ 1,476,013 $ (4,163) $ (1,184,492)
Ending Balances (in shares) at Mar. 31, 2022   126,297,000 0