Quarterly report pursuant to Section 13 or 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
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Property Plant And Equipment [Line Items]          
Depreciation expense $ 179 $ 247 $ 567 $ 681  
Accumulated depreciation 8,118   8,118   $ 8,656
Computer Equipment          
Property Plant And Equipment [Line Items]          
Property plant and equipment disposal 989   989    
Accumulated depreciation $ 952   $ 952