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Condensed 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, 2017 $ 372,138 $ 89 $ 1,572,765 $ (1,850) $ (1,198,866)
Begining balance (in shares) at Dec. 31, 2017   88,794      
Net income (loss) (41,818)       (41,818)
Unrealized gain (loss) on investments in available-for-sale debt securities, net of tax (1,847)     (1,847)  
Share-based compensation expense 19,879   19,879    
Issuance of common stock for vested restricted stock units (in shares)   343      
Issuance of common stock for stock option exercises 16,135 $ 1 16,134    
Issuance of common stock for stock option exercises (in shares)   745      
Ending balance at Mar. 31, 2018 364,487 $ 90 1,608,778 (3,697) (1,240,684)
Ending balance (in shares) at Mar. 31, 2018   89,882      
Begining balance at Dec. 31, 2017 372,138 $ 89 1,572,765 (1,850) (1,198,866)
Begining balance (in shares) at Dec. 31, 2017   88,794      
Net income (loss) 3,033        
Ending balance at Sep. 30, 2018 447,513 $ 91 1,645,311 (2,056) (1,195,833)
Ending balance (in shares) at Sep. 30, 2018   90,673      
Begining balance at Mar. 31, 2018 364,487 $ 90 1,608,778 (3,697) (1,240,684)
Begining balance (in shares) at Mar. 31, 2018   89,882      
Net income (loss) (5,913)       (5,913)
Unrealized gain (loss) on investments in available-for-sale debt securities, net of tax 888     888  
Share-based compensation expense 11,851   11,851    
Issuance of common stock for vested restricted stock units (in shares)   73      
Issuance of common stock for stock option exercises 6,123   6,123    
Issuance of common stock for stock option exercises (in shares)   448      
Ending balance at Jun. 30, 2018 377,436 $ 90 1,626,752 (2,809) (1,246,597)
Ending balance (in shares) at Jun. 30, 2018   90,403      
Net income (loss) 50,764       50,764
Unrealized gain (loss) on investments in available-for-sale debt securities, net of tax 753     753  
Share-based compensation expense 13,070   13,070    
Issuance of common stock for vested restricted stock units (in shares)   4      
Issuance of common stock for stock option exercises 5,490 $ 1 5,489    
Issuance of common stock for stock option exercises (in shares)   266      
Ending balance at Sep. 30, 2018 447,513 $ 91 1,645,311 (2,056) (1,195,833)
Ending balance (in shares) at Sep. 30, 2018   90,673      
Begining balance at Dec. 31, 2018 480,765 $ 91 1,660,361 (1,932) (1,177,755)
Begining balance (in shares) at Dec. 31, 2018   90,797      
Net income (loss) (102,115)       (102,115)
Unrealized gain (loss) on investments in available-for-sale debt securities, net of tax 1,699     1,699  
Share-based compensation expense 15,764   15,764    
Cumulative-effect adjustment to equity due to adoptionof ASU 2016-02 | ASU 2016-02 8,043       8,043
Issuance of common stock for vested restricted stock units (in shares)   353      
Issuance of common stock for stock option exercises 2,581   2,581    
Issuance of common stock for stock option exercises (in shares)   95      
Issuance of common stock for employee stock purchase plan 2,538   2,538    
Issuance of common stock for employee stock purchase plan (in shares)   39      
Ending balance at Mar. 31, 2019 409,275 $ 91 1,681,244 (233) (1,271,827)
Ending balance (in shares) at Mar. 31, 2019   91,284      
Begining balance at Dec. 31, 2018 480,765 $ 91 1,660,361 (1,932) (1,177,755)
Begining balance (in shares) at Dec. 31, 2018   90,797      
Net income (loss) 3,012        
Ending balance at Sep. 30, 2019 574,515 $ 92 1,739,517 1,606 (1,166,700)
Ending balance (in shares) at Sep. 30, 2019   92,080      
Begining balance at Mar. 31, 2019 409,275 $ 91 1,681,244 (233) (1,271,827)
Begining balance (in shares) at Mar. 31, 2019   91,284      
Net income (loss) 51,338       51,338
Unrealized gain (loss) on investments in available-for-sale debt securities, net of tax 878     878  
Share-based compensation expense 17,931   17,931    
Issuance of common stock for vested restricted stock units (in shares)   39      
Issuance of common stock for stock option exercises 4,284 $ 1 4,283    
Issuance of common stock for stock option exercises (in shares)   213      
Ending balance at Jun. 30, 2019 483,706 $ 92 1,703,458 645 (1,220,489)
Ending balance (in shares) at Jun. 30, 2019   91,536      
Net income (loss) 53,789       53,789
Unrealized gain (loss) on investments in available-for-sale debt securities, net of tax 961     961  
Share-based compensation expense 20,250   20,250    
Issuance of common stock for vested restricted stock units (in shares)   15      
Issuance of common stock for stock option exercises 13,164   13,164    
Issuance of common stock for stock option exercises (in shares)   490      
Issuance of common stock for employee stock purchase plan 2,645   2,645    
Issuance of common stock for employee stock purchase plan (in shares)   39      
Ending balance at Sep. 30, 2019 $ 574,515 $ 92 $ 1,739,517 $ 1,606 $ (1,166,700)
Ending balance (in shares) at Sep. 30, 2019   92,080