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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, 2020
Dec. 31, 2019
Property Plant And Equipment [Abstract]    
Office furniture and fixtures $ 1,650 $ 1,650
Software 4,530 4,379
Equipment 5,133 5,041
Leasehold improvements 1,721 1,721
Gross property and equipment 13,034 12,791
Less accumulated depreciation and amortization (9,495) (9,141)
Property and equipment, net $ 3,539 $ 3,650