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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Beginning Balance, Amount at Dec. 31, 2015 $ 121,708 $ 34 $ 322,833 $ (805) $ (200,354)
Beginning Balance, Shares at Dec. 31, 2015   34,313      
Issuance of common stock under stock plans, net of shares withheld for employee taxes 8,747 $ 2 8,745    
Issuance of common stock under stock plans, net of shares withheld for employee taxes, Shares   1,471      
Stock-based compensation 33,866   33,866    
Unrealized gain (loss) on investments, net of income taxes 113     113  
Cumulative translation adjustment (172)     (172)  
Net loss (45,562)       (45,562)
Ending Balance, Amount at Dec. 31, 2016 118,700 $ 36 365,444 (864) (245,916)
Ending Balance, Shares at Dec. 31, 2016   35,784      
Issuance of common stock under stock plans, net of shares withheld for employee taxes 7,921 $ 2 7,919    
Issuance of common stock under stock plans, net of shares withheld for employee taxes, Shares   1,719      
Stock-based compensation 48,933   48,933    
Unrealized gain (loss) on investments, net of income taxes (161)     (161)  
Cumulative adjustment from adoption of stock compensation standard     452   (452)
Cumulative translation adjustment 968     968  
Equity component of 2022 Notes (Note 7) 73,713   73,713    
Net loss (39,714)       (39,714)
Ending Balance, Amount at Dec. 31, 2017 210,360 $ 38 496,461 (57) (286,082)
Ending Balance, Shares at Dec. 31, 2017   37,503      
Issuance of common stock under stock plans, net of shares withheld for employee taxes 14,731 $ 2 14,729    
Issuance of common stock under stock plans, net of shares withheld for employee taxes, Shares   1,797      
Stock-based compensation 78,518   78,518    
Cumulative adjustment from adoption of revenue recognition standard (Note 2) 5,526       5,526
Unrealized gain (loss) on investments, net of income taxes 110     110  
Cumulative translation adjustment (776)     (776)  
Net loss (63,828)       (63,828)
Ending Balance, Amount at Dec. 31, 2018 $ 244,641 $ 40 $ 589,708 $ (723) $ (344,384)
Ending Balance, Shares at Dec. 31, 2018   39,300