Operating Leases - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Lessee Lease Description [Line Items]
Operating lease term	5 years
Rental expense for operating leases		$ 4,000,000
Operating lease ROU assets	$ 6,254,000
Operating lease liabilities	8,833,000
Cash paid for lease liabilities for operating leases	2,600,000
Right-of-use assets obtained in exchange for operating lease obligations	0
Operating lease obligations	0
Impairment charge	500,000
Impairment to leasehold improvements	$ 1,300,000
Weighted average remaining operating lease term	4 years 2 months 1 day
Weighted average discount rate	8.61%
New Leases
Lessee Lease Description [Line Items]
Operating lease ROU assets	$ 100,000
Operating lease liabilities	$ 100,000