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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Begining balance at Dec. 31, 2016 $ 314,877 $ 87 $ 1,371,432 $ (318) $ (1,056,324)
Begining balance (in shares) at Dec. 31, 2016   86,883      
Net income (loss) (142,542)       (142,542)
Unrealized gain (loss) on marketable securities (1,532)     (1,532)  
Share-based compensation expense 42,522   42,522    
Issuance of common stock for vested restricted stock units 1 $ 1      
Issuance of common stock for vested restricted stock units (in shares)   562      
Issuance of common stock for stock option exercises $ 13,864 $ 1 13,863    
Issuance of common stock for stock option exercises (in shares) 1,353 1,349      
Equity component of convertible debt, net $ 144,948   144,948    
Ending balance at Dec. 31, 2017 372,138 $ 89 1,572,765 (1,850) (1,198,866)
Ending balance (in shares) at Dec. 31, 2017   88,794      
Net income (loss) 21,111       21,111
Unrealized gain (loss) on marketable securities (82)     (82)  
Share-based compensation expense 58,068   58,068    
Issuance of common stock for vested restricted stock units (in shares)   429      
Issuance of common stock for stock option exercises $ 29,530 $ 2 29,528    
Issuance of common stock for stock option exercises (in shares) 1,592 1,574      
Ending balance at Dec. 31, 2018 $ 480,765 $ 91 1,660,361 (1,932) (1,177,755)
Ending balance (in shares) at Dec. 31, 2018   90,797      
Net income (loss) 37,012       37,012
Unrealized gain (loss) on marketable securities 3,345     3,345  
Share-based compensation expense 75,262   75,262    
Cumulative-effect adjustment to equity due toadoption of ASU 2016-02 | ASU 2016-02 8,043       8,043
Issuance of common stock for vested restricted stock units (in shares)   416      
Issuance of common stock for stock option exercises $ 27,313 $ 1 27,312    
Issuance of common stock for stock option exercises (in shares) 983 981      
Issuance of common stock for employee stockpurchase plan $ 5,183   5,183    
Issuance of common stock for employee stock purchase plan (in shares)   78      
Ending balance at Dec. 31, 2019 $ 636,923 $ 92 $ 1,768,118 $ 1,413 $ (1,132,700)
Ending balance (in shares) at Dec. 31, 2019   92,272