Contractual Payment Obligation - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Interest accreted on payment obligation	$ 139,000	$ 52,000
Interest accreted on long term payment obligation carrying value adjustment		$ 87,000
Settlement Agreement
Related Party Transaction [Line Items]
Amended installment payment, contractual payment period	Oct. 31, 2021
Increase in contractual payment obligation	$ 90,000