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Stock-Based Compensation - Summary of Stock-Based Compensation Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jan. 21, 2020
Mar. 31, 2020
Dec. 31, 2019
Options Outstanding, Shares Available for Grant      
Shares Available for Grant, Awards authorized 4,312,500    
2008 Plan, 2015 Plan and 2018 Plan [Member]      
Options Outstanding, Shares Available for Grant      
Shares Available for Grant, Beginning balance   51,514  
Shares Available for Grant, Awards authorized   4,387,187  
Shares Available for Grant, Granted   (1,435,857)  
Shares Available for Grant, forfeited/cancelled   23,053  
Shares Available for Grant, Ending balance   3,025,897 51,514
Options Outstanding, Number of Shares Outstanding      
Number of Shares Outstanding, Beginning balance   326,023  
Number of Shares Outstanding, Options granted   1,435,857  
Number of Shares Outstanding, Options forfeited/cancelled   (23,053)  
Number of Shares Outstanding, Ending balance   1,738,827 326,023
Number of Shares Outstanding, Exercisable   220,647  
Number of Shares Outstanding, Vested and expected to vest   1,738,827  
Options Outstanding, Weighted-Average Exercise Price Per Share      
Weighted-Average Exercise Price Per Share, Beginning balance   $ 102.56  
Weighted-Average Exercise Price Per Share, Options granted   13.31  
Weighted-Average Exercise Price Per Share, Options forfeited/cancelled   52.35  
Weighted-Average Exercise Price Per Share, Ending balance   29.52 $ 102.56
Weighted-Average Exercise Price Per Share, Exercisable   114.63  
Weighted-Average Exercise Price Per Share, Vested and expected to vest   $ 29.52  
Options Outstanding, Weighted-Average Remaining Contractual Term (Years)      
Weighted-Average Remaining Contractual Term (Years)   9 years 4 months 13 days 7 years 5 months 12 days
Weighted-Average Remaining Contractual Term (Year), Exercisable   6 years 2 months 23 days  
Weighted-Average Remaining Contractual Term (Year), Vested and expected to vest   9 years 4 months 13 days  
Options Outstanding, Aggregate Intrinsic Value of Outstanding Options      
Aggregate Intrinsic Value of Outstanding Options     $ 11