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Stock-based Compensation - Schedule of Restricted Stock Units Activity (Details)
shares in Thousands
9 Months Ended
Sep. 30, 2020
$ / shares
shares
Restricted Stock and Restricted Stock Units  
Restricted Stock and RSUs  
Unvested and outstanding, beginning balance (in shares) | shares 6,508
Forfeited (in shares) | shares (413)
Unvested, ending balance (in shares) | shares 8,524
Vested and not yet released (in shares) | shares 18
Outstanding at end of period (in shares) | shares 8,542
Weighted-Average Grant Date Fair Value  
Unvested, weighted average grant date fair value, beginning balance (in dollars per share) | $ / shares $ 11.08
Forfeited (in dollars per share) | $ / shares 12.55
Unvested, weighted average grant date fair value, ending balance (in dollars per share) | $ / shares 16.18
Vested and not yet released, weighted-average grant date fair value (in dollars per share) | $ / shares 36.77
Outstanding at end of period, weighted-average grant date fair value (in dollars per share) | $ / shares $ 16.22
Restricted Stock Units (RSUs)  
Restricted Stock and RSUs  
Granted (in shares) | shares 3,310
Vested (in shares) | shares (1,723)
Weighted-Average Grant Date Fair Value  
Granted (in dollars per share) | $ / shares $ 27.31
Vested (in dollars per share) | $ / shares $ 11.35
Restricted Stock  
Restricted Stock and RSUs  
Granted (in shares) | shares 949
Vested (in shares) | shares (107)
Weighted-Average Grant Date Fair Value  
Granted (in dollars per share) | $ / shares $ 17.06
Vested (in dollars per share) | $ / shares $ 17.06