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Share-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Weighted-average Exercise Price per Option, Granted $ 5.94  
Stock Options Outstanding    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of Shares under Option, Outstanding, Beginning balance 2,444  
Number of Shares under Option, Granted 502  
Number of Shares under Option, Exercised (26)  
Number of Shares under Option, Forfeited (65)  
Number of Shares under Option, Outstanding, Ending balance 2,855 2,444
Number of Shares under Option, Exercisable 1,426  
Number of Shares under Option, Vested and expected to vest 2,855  
Weighted-average Exercise Price per Option, Outstanding, Beginning balance $ 2.39  
Weighted-average Exercise Price per Option, Granted 5.94  
Weighted-average Exercise Price per Option, Exercised 1.43  
Weighted-average Exercise Price per Option, Forfeited 3.20  
Weighted-average Exercise Price per Option, Outstanding, Ending balance 3.00 $ 2.39
Weighted-average Exercise Price per Option, Exercisable 2.22  
Weighted-average Exercise Price per Option, Vested and expected to vest $ 3.00  
Weighted-average Remaining Contractual Life, Outstanding 7 years 7 months 6 days 7 years 8 months 12 days
Weighted-average Remaining Contractual Life, Exercisable 6 years 3 months 18 days  
Weighted-average Remaining Contractual Life, Vested and expected to vest 7 years 7 months 6 days  
Aggregate Intrinsic Value, Outstanding $ 67,395  
Aggregate Intrinsic Value, Exercisable 34,779  
Aggregate Intrinsic Value, Vested and expected to vest $ 67,395