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Share-Based Compensation - Summary of Stock Option Activity (Details) - Stock Options Outstanding - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares under Option, Outstanding, Beginning balance 2,415
Number of Shares under Option, Granted 1,029
Number of Shares under Option, Exercised (230)
Number of Shares under Option, Forfeited (620)
Number of Shares under Option, Outstanding, Ending balance 2,594
Number of Shares under Option, Exercisable 1,850
Number of Shares under Option, Vested and expected to vest 2,594
Weighted-average Exercise Price per Option, Outstanding, Beginning balance $ 7.11
Weighted-average Exercise Price per Option, Granted 2.01
Weighted-average Exercise Price per Option, Exercised 2.32
Weighted-average Exercise Price per Option, Forfeited 10.74
Weighted-average Exercise Price per Option, Outstanding, Ending balance 4.64
Weighted-average Exercise Price per Option, Exercisable 4.79
Weighted-average Exercise Price per Option, Vested and expected to vest $ 4.64
Weighted-average Remaining Contractual Life, Outstanding 7 years
Weighted-average Remaining Contractual Life, Exercisable 4 years 1 month 6 days
Weighted-average Remaining Contractual Life, Vested and expected to vest 7 years
Aggregate Intrinsic Value, Outstanding $ 5,535
Aggregate Intrinsic Value, Exercisable 2,495
Aggregate Intrinsic Value, Vested and expected to vest $ 5,535