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Stock-based Compensation - Schedule of Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs)
shares in Thousands
9 Months Ended
Sep. 30, 2019
$ / shares
shares
RSUs  
Unvested and outstanding, beginning balance (in shares) 0
Granted (in shares) 6,465
Vested (in shares) (317)
Forfeited (in shares) (280)
Unvested, ending balance (in shares) 5,868
Vested and not yet released (in shares) 317
Outstanding at end of period (in shares) 6,185
Weighted-Average Grant Date Fair Value  
Granted (in dollars per share) | $ / shares $ 9.74
Vested (in dollars per share) | $ / shares 8.62
Forfeited (in dollars per share) | $ / shares 8.70
Unvested, weighted average grant date fair value, ending balance (in dollars per share) | $ / shares 9.85
Vested and not yet released, weighted-average grant date fair value (in dollars per share) | $ / shares 8.62
Outstanding at end of period, weighted-average grant date fair value (in dollars per share) | $ / shares $ 9.79