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Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning Balance at Dec. 31, 2015 $ 355,995 $ 8 $ 606,555 $ (192) $ (250,376)
Beginning Balance, Shares at Dec. 31, 2015   81,311,686      
Exercise of stock options 1,003 $ 0 1,003 0 0
Exercise of stock options, Shares   2,188,204      
Stock-based compensation expense 62,586 $ 0 62,586 0 0
Vesting of restricted stock units   514,316      
Employee payroll taxes withheld related to vesting of restricted stock units (592) $ 0 (592) 0 0
Employee payroll taxes withheld related to vesting of restricted stock units, Shares   (85,191)      
Exercise of warrants 41 $ 0 41 0 0
Exercise of warrants, Shares   40,514      
Change in accounting principle - ASU 2016-09 forfeiture adjustment 0 $ 0 31 0 (31)
Repurchase of common stock $ (11,898) $ 0 0 0 (11,898)
Repurchase of common stock, Shares (1,594,040) (1,594,040)      
Other comprehensive income, net $ 327 $ 0 0 327 0
Net loss (96,571) 0 0 0 (96,571)
Ending Balance at Sep. 30, 2016 $ 310,891 $ 8 $ 669,624 $ 135 $ (358,876)
Ending Balance, Shares at Sep. 30, 2016   82,375,489