Leases - Schedule of Future Minimum Sublease Rental Income under Operating Leases for Continuing Operations (Detail) $ in Thousands	Dec. 31, 2020 USD ($)
Leases [Abstract]
Operating Subleases, 2021	$ 949	[1]
Operating Subleases, 2022	777
Operating Subleases, 2023	330
Operating Subleases, Total	$ 2,056

[1] Sublease receivables remaining as of December 31, 2020