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Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]      
Total property and equipment $ 572 $ 572 $ 406
Less: accumulated depreciation (192) (158) (85)
Property and equipment, net 380 414 321
Leasehold Improvements      
Property Plant And Equipment [Line Items]      
Total property and equipment 17 17 65
Machinery and Equipment      
Property Plant And Equipment [Line Items]      
Total property and equipment     38
Furniture and Fixtures      
Property Plant And Equipment [Line Items]      
Total property and equipment 397 397 194
Computers      
Property Plant And Equipment [Line Items]      
Total property and equipment 125 125 76
Office Equipment      
Property Plant And Equipment [Line Items]      
Total property and equipment 11 11 11
Software      
Property Plant And Equipment [Line Items]      
Total property and equipment $ 22 $ 22 $ 22