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Nature of the Business and Basis of Presentation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
May 06, 2019
Mar. 31, 2020
Mar. 30, 2019
Dec. 28, 2019
Convertible preferred stock conversion ratio   3.5-for-one    
Equity Method Investment, Ownership Percentage       100.00%
Net loss   $ (8,852) $ (6,895) $ (33,500)
Accumulated deficit   (378,335)   $ (369,483)
Cash equivalents and marketable securities   72,600    
Underwriting discounts and commissions and other offering costs   $ 120 $ 705  
IPO [Member]        
Stock Issued During Period, Shares, New Issues 6,543,500      
Net proceeds from initial public offering $ 91,400      
Underwriting discounts and commissions and other offering costs $ 6,000      
Over-Allotment Option [Member]        
Stock Issued During Period, Shares, New Issues 853,500