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Property and Equipment - Depreciation and Amortization on Property and Equipment Using the Straight-Line Method (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Property Plant And Equipment [Abstract]    
Office furniture and fixtures $ 1,636 $ 1,626
Software 3,970 3,686
Equipment 4,911 4,814
Leasehold improvements 1,721 1,721
Gross property and equipment 12,238 11,847
Less accumulated depreciation and amortization (8,606) (7,892)
Property and equipment, net $ 3,632 $ 3,955