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Stock-Based Awards - Summary of Stock Option Activity (Details) - 2018 Stock Option and Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Number of Shares, Outstanding beginning balance 4,414,225  
Number of Shares, Granted 1,518,500  
Number of Shares, Exercised (110,156)  
Number of Shares, Forfeited (404,456)  
Number of Shares, Outstanding ending balance 5,418,113 4,414,225
Number of Shares, Options exercisable at December 31, 2019 2,919,360  
Number of Shares, Vested and expected to vest at December 31, 2019 5,418,113  
Weighted Average Exercise Price, Outstanding beginning balance $ 6.79  
Weighted Average Exercise Price, Granted 4.06  
Weighted Average Exercise Price, Exercised 2.31  
Weighted Average Exercise Price, Forfeited 6.85  
Weighted Average Exercise Price, Outstanding ending balance 6.11 $ 6.79
Weighted Average Exercise Price, Options exercisable at December 31, 2019 5.54  
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2019 $ 6.11  
Weighted Average Remaining Contractual Term (in years), Outstanding 7 years 8 months 8 days 8 years 3 months 14 days
Weighted Average Remaining Contractual Term (in years), Options exercisable 7 years 7 days  
Weighted Average Remaining Contractual Term (in years), Vested and expected to vest 7 years 8 months 8 days  
Aggregate Intrinsic Value $ 690 $ 2,031
Aggregate Intrinsic Value, Options exercisable at December 31, 2019 665  
Aggregate Intrinsic Value, Vested and expected to vest at December 31, 2019 $ 690