Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Lessee Lease Description [Line Items]
Operating lease - long term right-of-use asset	$ 2,500	$ 4,406
Operating Liabilities	$ 2,524	4,432
Lease, option to terminate	leases can be terminated with 30-day prior written notice
Lease termination period with prior written notice	30 days
Operating lease costs	$ 2,400	2,100
Loss on lease	$ 0	$ 4,247
ASU 2016-02 [Member]
Lessee Lease Description [Line Items]
Operating lease - long term right-of-use asset			$ 5,400
Operating Liabilities			$ 5,400