Leases - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Leases [Abstract]
Operating lease term	4 years
Operating lease ROU assets	$ 4,517,000		$ 4,894,000
Short-term operating lease liabilities	4,300,000
Long-term operating lease liabilities	2,300,000
Cash paid for lease liabilities for operating leases	700,000	$ 700,000
Right-of-use assets obtained in exchange for operating lease obligations	0
Operating lease obligations	0
Sublease income	$ 100,000	$ 100,000
Weighted average remaining operating lease term	3 years 7 days
Weighted average discount rate	8.41%