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Consolidated Statements of Changes in Stockholders' Equity (Deficit) (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common stock
Treasury stock
Additional paid-in-capital
Additional paid-in-capital
Cumulative Effect, Period of Adoption, Adjustment
Accumulated other comprehensive gain (loss)
Accumulated deficit
Accumulated deficit
Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Dec. 31, 2019     49,911 487          
Beginning balance at Dec. 31, 2019 $ 83,168   $ 499 $ (4,764) $ 605,650   $ 213 $ (518,430)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock-based compensation expense 12,965       12,965        
Issuance of common stock under employee stock purchase plan (in shares)     102            
Issuance of common stock under employee stock purchase plan 3,346   $ 1   3,345        
Vesting of restricted stock units (in shares)     308            
Vesting of restricted stock units 0   $ 3   (3)        
Shares withheld for employee taxes (in shares)     (27)            
Shares withheld for employee taxes (1,533)       (1,533)        
Issuance of common stock upon exercise of stock options (in shares)     125            
Issuance of common stock upon exercise of stock options 1,569   $ 1   1,568        
Other comprehensive loss (291)           (291)    
Net loss (22,924)             (22,924)  
Ending balance (in shares) at Mar. 31, 2020     50,419 487          
Ending balance at Mar. 31, 2020 $ 76,300   $ 504 $ (4,764) 621,992   (78) (541,354)  
Accounting Standards Update [Extensible List] Accounting Standards Update 2020-06                
Beginning balance (in shares) at Dec. 31, 2020     52,225 487          
Beginning balance at Dec. 31, 2020 $ 71,536 $ (71,441) $ 522 $ (4,764) 692,603 $ (99,026) 454 (617,279) $ 27,585
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Stock-based compensation expense 22,284       22,284        
Issuance of common stock under employee stock purchase plan (in shares)     148            
Issuance of common stock under employee stock purchase plan 4,467   $ 1   4,466        
Vesting of restricted stock units (in shares)     374            
Vesting of restricted stock units 0   $ 4   (4)        
Shares withheld for employee taxes (in shares)     (38)            
Shares withheld for employee taxes (3,324)       (3,324)        
Issuance of common stock upon exercise of stock options (in shares)     170            
Issuance of common stock upon exercise of stock options 1,418   $ 2   1,416        
Purchase of capped calls related to convertible senior notes (76,020)       (76,020)        
Issuance of common stock in connection with repurchase of convertible senior notes (in shares)     2,177            
Issuance of common stock in connection with repurchase of convertible senior notes (2,698)   $ 22   (2,720)        
Issuance of common stock in connection with inducement of convertible senior notes (in shares)     35            
Issuance of common stock in connection with inducement of convertible senior notes 2,740       2,740        
Other comprehensive loss (342)           (342)    
Net loss (29,845)             (29,845)  
Ending balance (in shares) at Mar. 31, 2021     55,091 487          
Ending balance at Mar. 31, 2021 $ (81,225)   $ 551 $ (4,764) $ 542,415   $ 112 $ (619,539)