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Stockholders' Equity - Equity Award Activity - RSUs (Details) - Restricted stock units - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Number of Restricted Stock Units    
Number of units, beginning balance (in shares)   6,791
Number of units granted (in shares) 200 3,344
Number of units released (in shares)   (2,021)
Number units canceled (in shares)   (535)
Number of units, ending balance (in shares) 7,579 7,579
Weighted- Average Grant Date Fair Value Per Share    
Weighted-average grant date fair value per share, beginning balance (in usd per share)   $ 11.55
Weighted-average grant date fair value per share, granted (in usd per share)   10.92
Weighted-average grant date fair value per share, released (in usd per share)   13.12
Weighted-average grant date fair value per share, canceled (in usd per share)   11.32
Weighted-average grant date fair value per share, ending balance (in usd per share) $ 10.87 $ 10.87
Aggregate Intrinsic Value    
Aggregate intrinsic value, beginning balance   $ 42,988
Aggregate intrinsic value, RSUs released   22,849
Aggregate intrinsic value, ending balance $ 75,257 $ 75,257