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Property and Equipment - Depreciation and Amortization on Property and Equipment Using the Straight-Line Method (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Property Plant And Equipment [Abstract]    
Office furniture and fixtures $ 1,650 $ 1,650
Software 5,149 5,004
Equipment 5,044 4,967
Leasehold improvements 1,658 1,658
Gross property and equipment 13,501 13,279
Less accumulated depreciation and amortization (10,357) (10,007)
Property and equipment, net $ 3,144 $ 3,272