Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net - Additional Information (Detail)

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Property and Equipment, Net - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Property, Plant and Equipment [Abstract]    
Fully depreciated computer software and hardware equipment and furniture, fixtures and equipment write-off $ 968,000 $ 3,300,000
Property and equipment additions incurred but not yet paid 430,000 $ 264,000
Impairment of Long-Lived Assets Held-for-use $ 0