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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Common Stock
Additional Paid-in Capital
Cumulative effect adjustment
Additional Paid-in Capital
Accumulated Deficit
Cumulative effect adjustment
Accumulated Deficit
Cumulative effect adjustment
Total
Balance at Dec. 31, 2019 $ 542   $ 625,048   $ (734,611)   $ (109,021)
Balance (in shares) at Dec. 31, 2019 54,200,810            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock in direct offering, net of offering costs $ 69   93,606       93,675
Issuance of common stock in direct offering, net of offering costs (in shares) 6,900,000            
Issuance of common stock upon exercise of stock options $ 5   5,017       5,022
Issuance of common stock upon exercise of stock options (in shares) 556,421            
Issuance of common stock upon grant of restricted stock awards     155       155
Issuance of common stock upon grant of restricted stock awards (in shares) 14,000            
Equity component of 2026 Notes, net of issuance costs     61,628       61,628
Purchases of 2026 Capped Calls     (23,223)       (23,223)
Equity component of early extinguishment of 2023 Notes     (22,073)       (22,073)
Termination of the 2023 Capped Call contracts related to debt repurchased     8,387       8,387
Income tax benefit related to issuance of 2026 Notes     (12,011)       (12,011)
Stock-based compensation     14,770       14,770
Net income (loss)         (138,061)   (138,061)
Balance (ASU 2020-06) at Dec. 31, 2020   $ (70,777)   $ (4,697)   $ (75,474)  
Balance at Dec. 31, 2020 $ 616   751,304   (872,672)   (120,752)
Balance (in shares) at Dec. 31, 2020 61,671,231            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock upon exercise of stock options $ 10   8,372       8,382
Issuance of common stock upon exercise of stock options (in shares) 945,924            
Issuance of common stock upon grant of restricted stock awards     91       91
Issuance of common stock upon grant of restricted stock awards (in shares) 11,700            
At the market offering fees     (241)       (241)
Stock-based compensation     17,539       17,539
Net income (loss)         194,235   194,235
Balance at Dec. 31, 2021 $ 626   706,288   (683,134)   23,780
Balance (in shares) at Dec. 31, 2021 62,628,855            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock upon exercise of stock options $ 1   414       $ 415
Issuance of common stock upon exercise of stock options (in shares) 101,160           101,160
Issuance of common stock upon vesting of restricted stock units $ 1   (1)        
Issuance of common stock upon vesting of restricted stock units (in shares) 98,750            
Stock-based compensation     14,072       $ 14,072
Net income (loss)         47,417   47,417
Balance at Dec. 31, 2022 $ 628   $ 720,773   $ (635,717)   $ 85,684
Balance (in shares) at Dec. 31, 2022 62,828,765