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Stockholders' Equity - RSU Activity (Details) - Restricted stock units
shares in Thousands
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Number of Shares  
Outstanding, beginning balance (in shares) | shares 2,033
RSUs granted (in shares) | shares 1,285
RSUs vested and released (in shares) | shares (534)
RSUs forfeited (in shares) | shares (79)
Outstanding, ending balance (in shares) | shares 2,705
Weighted Average Grant Date Fair Value Per Share  
Outstanding, beginning balance, weighted-average grant date fair value per share (in USD per share) | $ / shares $ 12.81
RSUs granted, weighted average grant date fair value (in USD per share) | $ / shares 30.51
RSUs vested and released, weighted average grant date fair value (in USD per share) | $ / shares 12.25
RSUs forfeited, weighted average grant date fair value (in USD per share) | $ / shares 17.64
Outstanding, ending balance, weighted-average grant date fair value per share (in USD per share) | $ / shares $ 21.18