Annual report pursuant to Section 13 and 15(d)

Furniture, Equipment and Leasehold Improvements, Net - Additional Information (Detail)

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Furniture, Equipment and Leasehold Improvements, Net - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]      
Depreciation and amortization $ 747 $ 975 $ 737
Accumulated depreciation 8,298 $ 8,656  
Computer Equipment      
Property Plant And Equipment [Line Items]      
Property plant and equipment disposal 989    
Accumulated depreciation $ 952