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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common stock
Treasury stock
Additional paid-in-capital
Accumulated other comprehensive gain (loss)
Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2018   47,600 487      
Beginning balance at Dec. 31, 2018 $ 87,319 $ 476 $ (4,764) $ 556,223 $ (31) $ (464,585)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 29,490     29,490    
Issuance of common stock under employee stock purchase plan (in shares)   185        
Issuance of common stock under employee stock purchase plan 5,521 $ 2   5,519    
Vesting of restricted stock units (in shares)   914        
Vesting of restricted stock units 0 $ 9   (9)    
Shares withheld for employee taxes (in shares)   (96)        
Shares withheld for employee taxes (4,926) $ (1)   (4,925)    
Issuance of common stock upon exercise of stock options (in shares)   700        
Issuance of common stock upon exercise of stock options 7,935 $ 7   7,928    
Other comprehensive income (loss) 335       335  
Net loss (39,499)         (39,499)
Ending balance (in shares) at Sep. 30, 2019   49,303 487      
Ending balance at Sep. 30, 2019 86,175 $ 493 $ (4,764) 594,226 304 (504,084)
Beginning balance (in shares) at Jun. 30, 2019   48,798 487      
Beginning balance at Jun. 30, 2019 87,524 $ 488 $ (4,764) 581,127 351 (489,678)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 10,426     10,426    
Issuance of common stock under employee stock purchase plan (in shares)   74        
Issuance of common stock under employee stock purchase plan 2,887 $ 1   2,886    
Vesting of restricted stock units (in shares)   319        
Vesting of restricted stock units 0 $ 3   (3)    
Shares withheld for employee taxes (in shares)   (38)        
Shares withheld for employee taxes (2,087)     (2,087)    
Issuance of common stock upon exercise of stock options (in shares)   150        
Issuance of common stock upon exercise of stock options 1,878 $ 1   1,877    
Other comprehensive income (loss) (47)       (47)  
Net loss (14,406)         (14,406)
Ending balance (in shares) at Sep. 30, 2019   49,303 487      
Ending balance at Sep. 30, 2019 86,175 $ 493 $ (4,764) 594,226 304 (504,084)
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 45,449     45,449    
Issuance of common stock under employee stock purchase plan (in shares)   234        
Issuance of common stock under employee stock purchase plan 7,082 $ 2   7,080    
Vesting of restricted stock units (in shares)   1,092        
Vesting of restricted stock units 0 $ 11   (11)    
Shares withheld for employee taxes (in shares)   (112)        
Shares withheld for employee taxes (5,984)     (5,984)    
Issuance of common stock upon exercise of stock options (in shares)   652        
Issuance of common stock upon exercise of stock options 6,228 $ 6   6,222    
Other comprehensive income (loss) (236)       (236)  
Equity component of convertible senior notes, net 46,832     46,832    
Purchase of capped calls related to convertible senior notes (27,255)     (27,255)    
Net loss (69,931)         (69,931)
Ending balance (in shares) at Sep. 30, 2020   51,777 487      
Ending balance at Sep. 30, 2020 85,353 $ 518 $ (4,764) 677,983 (23) (588,361)
Beginning balance (in shares) at Jun. 30, 2020   50,952 487      
Beginning balance at Jun. 30, 2020 90,688 $ 509 $ (4,764) 657,678 85 (562,820)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 16,620     16,620    
Issuance of common stock under employee stock purchase plan (in shares)   132        
Issuance of common stock under employee stock purchase plan 3,736 $ 1   3,735    
Vesting of restricted stock units (in shares)   369        
Vesting of restricted stock units 0 $ 4   (4)    
Shares withheld for employee taxes (in shares)   (43)        
Shares withheld for employee taxes (2,534)     (2,534)    
Issuance of common stock upon exercise of stock options (in shares)   367        
Issuance of common stock upon exercise of stock options 2,495 $ 4   2,491    
Other comprehensive income (loss) (108)       (108)  
Equity component of convertible senior notes, net (3)     (3)    
Net loss (25,541)         (25,541)
Ending balance (in shares) at Sep. 30, 2020   51,777 487      
Ending balance at Sep. 30, 2020 $ 85,353 $ 518 $ (4,764) $ 677,983 $ (23) $ (588,361)