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Stock-Based Compensation - Summary of Stock Option Activity (Details) - Options Issued and Outstanding - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding, beginning, Shares Available for Grant 1,350,582  
Shares reserved for issuance, Shares Available for Grant 1,122,213  
Options granted, Shares Available for Grant (1,286,524)  
Options cancelled, Shares Available for Grant 116,850  
Outstanding, ending, Shares Available for Grant 1,303,121 1,350,582
Outstanding, beginning, Number of Options 1,122,677  
Options granted, Number of Options 1,286,524  
Options exercised, Number of Options (7,029)  
Options cancelled, Number of Options (116,850)  
Outstanding, ending, Number of Options 2,285,322 1,122,677
Exercisable, Number of Options 373,574  
Vested and expected to vest, Number of Options 2,285,322  
Outstanding, beginning, Weighted-Average Exercise Price per Option $ 11.63  
Options granted, Weighted-Average Exercise Price per Option 8.66  
Options exercised, Weighted-Average Exercise Price per Option 0.79  
Options cancelled, Weighted-Average Exercise Price per Option 10.25  
Outstanding, ending, Weighted-Average Exercise Price per Option 10.05 $ 11.63
Exercisable, Weighted-Average Exercise Price per Option 11.40  
Vested and expected to vest, Weighted-Average Exercise Price per Option $ 8.63  
Outstanding, beginning, Weighted-Average Remaining Contract Term 9 years 18 days 9 years 2 months 19 days
Exercisable, Weighted-Average Remaining Contract Term 8 years 3 months 29 days  
Vested and expected to vest, Weighted-Average Remaining Contract Term 9 years 18 days  
Outstanding, ending, Aggregate Intrinsic Value $ 1,360  
Exercisable, Aggregate Intrinsic Value 387  
Vested and expected to vest, Aggregate Intrinsic Value $ 1,360