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Share-Based Compensation - Summary of Stock Option Activity (Details) - Stock Options Outstanding
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares under Option, Outstanding, Beginning balance | shares 2,415
Number of Shares under Option, Granted | shares 28
Number of Shares under Option, Exercised | shares (49)
Number of Shares under Option, Forfeited | shares (70)
Number of Shares under Option, Outstanding, Ending balance | shares 2,324
Number of Shares under Option, Exercisable | shares 1,277
Number of Shares under Option, Vested and expected to vest | shares 2,324
Weighted-average Exercise Price per Option, Outstanding, Beginning balance | $ / shares $ 7.11
Weighted-average Exercise Price per Option, Granted | $ / shares 2.94
Weighted-average Exercise Price per Option, Exercised | $ / shares 1.56
Weighted-average Exercise Price per Option, Forfeited | $ / shares 12.01
Weighted-average Exercise Price per Option, Outstanding, Ending balance | $ / shares 7.03
Weighted-average Exercise Price per Option, Exercisable | $ / shares 4.02
Weighted-average Exercise Price per Option, Vested and expected to vest | $ / shares $ 7.03
Weighted-average Remaining Contractual Life, Outstanding 7 years 3 months 18 days
Weighted-average Remaining Contractual Life, Exercisable 6 years 2 months 12 days
Weighted-average Remaining Contractual Life, Vested and expected to vest 7 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding | $ $ 553
Aggregate Intrinsic Value, Exercisable | $ 553
Aggregate Intrinsic Value, Vested and expected to vest | $ $ 553