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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Treasury Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance (in shares) at Dec. 31, 2017     44,054 487        
Beginning Balance at Dec. 31, 2017 $ 24,153 $ 25,873 $ 441 $ (4,764) $ 463,428 $ (39) $ (434,913) $ 25,873
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock-based compensation expense 27,593       27,593      
Equity component of convertible senior notes, net 52,194       52,194      
Purchase of capped calls related to convertible senior notes (26,910)       (26,910)      
Issuance of common stock related to secondary offering (in shares)     1,500          
Issuance of common stock related to secondary offering 30,907   $ 15   30,892      
Issuance of common stock under ESPP (in shares)     219          
Issuance of common stock under employee stock purchase plan 3,637   $ 2   3,635      
Vesting of restricted stock units (in shares)     973          
Vesting of restricted stock units 0   $ 10   (10)      
Forfeiture of restricted stock awards (in shares)     (3)          
Forfeiture of restricted stock awards 0              
Shares withheld for employee taxes (in shares)     (88)          
Shares withheld for employee taxes (2,197)   $ (1)   (2,196)      
Issuance of common stock upon exercise of stock options (in shares)     945          
Issuance of common stock upon exercise of stock options 7,606   $ 9   7,597      
Other comprehensive income 8         8    
Net loss (55,545)           (55,545)  
Ending Balance (in shares) at Dec. 31, 2018     47,600 487        
Ending 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 40,664       40,664      
Issuance of common stock under ESPP (in shares)     185          
Issuance of common stock under employee stock purchase plan 5,521   $ 2   5,519      
Vesting of restricted stock units (in shares)     1,292          
Vesting of restricted stock units 0   $ 13   (13)      
Shares withheld for employee taxes (in shares)     (134)          
Shares withheld for employee taxes (6,952)   $ (2)   (6,950)      
Issuance of common stock upon exercise of stock options (in shares)     968          
Issuance of common stock upon exercise of stock options 10,217   $ 10   10,207      
Other comprehensive income 244         244    
Net loss (53,845)           (53,845)  
Ending Balance (in shares) at Dec. 31, 2019     49,911 487        
Ending 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 61,419       61,419      
Equity component of convertible senior notes, net 46,832       46,832      
Purchase of capped calls related to convertible senior notes (27,255)       (27,255)      
Issuance of common stock under ESPP (in shares)     233          
Issuance of common stock under employee stock purchase plan 7,082   $ 2   7,080      
Vesting of restricted stock units (in shares)     1,451          
Vesting of restricted stock units 0   $ 15   (15)      
Shares withheld for employee taxes (in shares)     (154)          
Shares withheld for employee taxes (8,921)   $ (2)   (8,919)      
Issuance of common stock upon exercise of stock options (in shares)     784          
Issuance of common stock upon exercise of stock options 7,819   $ 8   7,811      
Other comprehensive income 241         241    
Net loss (98,849)           (98,849)  
Ending Balance (in shares) at Dec. 31, 2020     52,225 487        
Ending Balance at Dec. 31, 2020 $ 71,536   $ 522 $ (4,764) $ 692,603 $ 454 $ (617,279)