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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Adjustment
Common Stock (Class A and B)
Additional Paid-in-Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Accumulated Deficit
Adjustment
Balance at the beginning of the period (in shares) at Dec. 31, 2017     42,369,000        
Beginning of the period at Dec. 31, 2017 $ (16,934) $ 8,381 $ 42 $ 248,289 $ 72 $ (265,337) $ 8,381
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense 30,841     30,841      
Issuance of common stock upon exercise of stock options (in shares)     1,481,000        
Issuance of common stock upon exercise of stock options 16,662   $ 2 16,660      
Issuance of common stock under employee stock purchase plan (in shares)     179,000        
Issuance of common stock under employee stock purchase plan 3,216     3,216      
Issuance of restricted stock units (in shares)     99,000        
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)     (84,000)        
Tax withholdings related to net share settlements of stock-based compensation awards (1,861)     (1,861)      
Net loss (50,071)         (50,071)  
Other comprehensive income (loss) 26       26    
Balance at the end of the period (in shares) at Dec. 31, 2018     44,044,000        
End of the period at Dec. 31, 2018 (9,740) $ (11,796) $ 44 297,145 98 (307,027) $ (11,796)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense 35,784     35,784      
Issuance of common stock upon exercise of stock options (in shares)     1,997,000        
Issuance of common stock upon exercise of stock options 24,152   $ 3 24,149      
Issuance of common stock under employee stock purchase plan (in shares)     188,000        
Issuance of common stock under employee stock purchase plan 4,922     4,922      
Issuance of restricted stock units (in shares)     420,000        
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)     (10,000)        
Tax withholdings related to net share settlements of stock-based compensation awards (390)     (390)      
Equity component of convertible senior notes, net 58,560     58,560      
Net loss (47,479)         (47,479)  
Other comprehensive income (loss) 189       189    
Balance at the end of the period (in shares) at Dec. 31, 2019     46,639,000        
End of the period at Dec. 31, 2019 54,202   $ 47 420,170 287 (366,302)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation expense $ 45,771     45,771      
Issuance of common stock upon exercise of stock options (in shares) 1,398,142   1,398,000        
Issuance of common stock upon exercise of stock options $ 19,189   $ 2 19,187      
Issuance of common stock under employee stock purchase plan (in shares)     187,000        
Issuance of common stock under employee stock purchase plan 7,227     7,227      
Issuance of restricted stock units (in shares)     796,000        
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)     (231,000)        
Tax withholdings related to net share settlements of stock-based compensation awards (13,657)     (13,657)      
Net loss (48,398)         (48,398)  
Other comprehensive income (loss) (57)       (57)    
Balance at the end of the period (in shares) at Dec. 31, 2020     48,789,000        
End of the period at Dec. 31, 2020 $ 64,277   $ 49 $ 478,698 $ 230 $ (414,700)