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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 (Loss) Gain
Accumulated Deficit
Begining balance at Dec. 31, 2015 $ 424,454 $ 86 $ 1,340,579 $ (977) $ (915,234)
Begining balance (in shares) at Dec. 31, 2015   86,263      
Net income (loss) (141,090) $ 0 0 0 (141,090)
Unrealized gains (losses) on available for sale investments 659 0 0 659 0
Share-based compensation expense 28,464 0 28,464 0 0
Issuance of common stock for vested restricted stock units 0 $ 0 0 0 0
Issuance of common stock for vested restricted stock units (in shares)   284      
Issuance of common stock for stock option exercises $ 2,390 $ 1 2,389 0 0
Issuance of common stock for stock option exercises (in shares) 341 336      
Ending balance at Dec. 31, 2016 $ 314,877 $ 87 1,371,432 (318) (1,056,324)
Ending balance (in shares) at Dec. 31, 2016   86,883      
Net income (loss) (142,542) $ 0 0 0 (142,542)
Unrealized gains (losses) on available for sale investments (1,532) 0 0 (1,532) 0
Share-based compensation expense 42,522 0 42,522 0 0
Issuance of common stock for vested restricted stock units 1 $ 1 0 0 0
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 0 0
Issuance of common stock for stock option exercises (in shares) 1,353 1,349      
Equity component of convertible debt, net of issuance costs $ 144,948 $ 0 144,948 0 0
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 $ 0 0 0 21,111
Unrealized gains (losses) on available for sale investments (82) 0 0 (82) 0
Share-based compensation expense 58,068 0 58,068 0 0
Issuance of common stock for vested restricted stock units 0 $ 0 0 0 0
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 0 0
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