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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
6 Months Ended
Jun. 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 28
Number of Shares under Option, Exercised (98)
Number of Shares under Option, Forfeited (480)
Number of Shares under Option, Outstanding, Ending balance 1,865
Number of Shares under Option, Exercisable 1,312
Number of Shares under Option, Vested and expected to vest 1,865
Weighted-average Exercise Price per Option, Outstanding, Beginning balance $ 7.11
Weighted-average Exercise Price per Option, Granted 2.94
Weighted-average Exercise Price per Option, Exercised 1.28
Weighted-average Exercise Price per Option, Forfeited 11.16
Weighted-average Exercise Price per Option, Outstanding, Ending balance 6.31
Weighted-average Exercise Price per Option, Exercisable 4.63
Weighted-average Exercise Price per Option, Vested and expected to vest $ 6.31
Weighted-average Remaining Contractual Life, Outstanding 5 years 2 months 12 days
Weighted-average Remaining Contractual Life, Exercisable 3 years 9 months 18 days
Weighted-average Remaining Contractual Life, Vested and expected to vest 5 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding $ 527
Aggregate Intrinsic Value, Exercisable 527
Aggregate Intrinsic Value, Vested and expected to vest $ 527