Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	1 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounting Policies [Line Items]
Cash, FDIC insured amount	$ 250,000
Royalty [Member]
Accounting Policies [Line Items]
Deferred revenue	$ 3,000,000		$ 3,000,000
Black-Scholes Option Pricing Model [Member] | Options vesting on first anniversary of grant date [Member]
Accounting Policies [Line Items]
Volatility rate	86.98%	97.40%
Risk-free interest rate	0.28%	0.52%
Weighted average expected life (in years)	5 years	5 years 6 months
Dividend yield	0.00%	0.00%