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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Property Plant And Equipment [Line Items]          
Depreciation expense $ 267 $ 179 $ 815 $ 567  
Leased assets write off 0   310    
Accumulated depreciation $ 8,569   $ 8,569   $ 8,298
Computer Equipment          
Property Plant And Equipment [Line Items]          
Property plant and equipment disposal   989   989  
Accumulated depreciation   $ 952   $ 952