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Stock-Based Compensation - Summary of Stock Option Activity (Details) - Options Issued and Outstanding - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 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 (604,440)  
Options cancelled, Shares Available for Grant 20,800  
Outstanding, ending, Shares Available for Grant 1,889,155 1,350,582
Outstanding, beginning, Number of Options 1,122,677  
Options granted, Number of Options 604,440  
Options cancelled, Number of Options (20,800)  
Outstanding, ending, Number of Options 1,706,317 1,122,677
Exercisable, Number of Options 194,221  
Vested and expected to vest, Number of Options 1,706,317  
Outstanding, beginning, Weighted-Average Exercise Price per Option $ 11.63  
Options granted, Weighted-Average Exercise Price per Option 8.58  
Options cancelled, Weighted-Average Exercise Price per Option 9.91  
Outstanding, ending, Weighted-Average Exercise Price per Option 10.57 $ 11.63
Exercisable, Weighted-Average Exercise Price per Option 11.62  
Vested and expected to vest, Weighted-Average Exercise Price per Option $ 10.57  
Outstanding, beginning, Weighted-Average Remaining Contract Term 9 years 3 months 18 days 9 years 2 months 19 days
Exercisable, Weighted-Average Remaining Contract Term 8 years 8 months 12 days  
Vested and expected to vest, Weighted-Average Remaining Contract Term 9 years 3 months 18 days  
Outstanding, ending, Aggregate Intrinsic Value $ 627  
Exercisable, Aggregate Intrinsic Value 202  
Vested and expected to vest, Aggregate Intrinsic Value $ 627