Contractual Payment Obligation - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Related Party Transaction [Line Items]
Interest accreted on payment obligation	$ 19,000	$ 32,000
Settlement Agreement
Related Party Transaction [Line Items]
Amended installment payment, contractual payment period	Oct. 31, 2021
Increase in contractual payment obligation	$ 90,000