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Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Options Issued and Outstanding    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding, beginning, Shares Available for Grant 215,043  
Shares reserved for issuance, Shares Available for Grant 1,457,789  
Options cancelled, Shares Available for Grant 260,365  
Outstanding, ending, Shares Available for Grant 2,007,250 215,043
Outstanding, beginning, Number of Options 2,562,800  
Options cancelled, Number of Options (260,365)  
Outstanding, ending, Number of Options 2,302,435 2,562,800
Exercisable, Number of Options 577,853  
Vested and expected to vest, Number of Options 2,302,435  
Outstanding, beginning, Weighted-Average Exercise Price per Option $ 7.85  
Options cancelled, Weighted-Average Exercise Price per Option 8.57  
Outstanding, ending, Weighted-Average Exercise Price per Option 7.76 $ 7.85
Exercisable, Weighted-Average Exercise Price per Option 10.75  
Vested and expected to vest, Weighted-Average Exercise Price per Option $ 7.76  
Outstanding, Weighted-Average Remaining Contract Term 8 years 6 months 18 days 8 years 10 months 2 days
Exercisable, Weighted-Average Remaining Contract Term 7 years 2 months 1 day  
Vested and expected to vest, Weighted-Average Remaining Contract Term 8 years 6 months 18 days  
Outstanding, ending, Aggregate Intrinsic Value $ 21  
Exercisable, Aggregate Intrinsic Value 12  
Vested and expected to vest, Aggregate Intrinsic Value $ 21  
Restricted Stock Units    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Other than options cancelled, Shares Available for Grant 74,053