Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Significant Accounting Policies [Line Items]
Accounts receivable, allowance for doubtful accounts	$ 0	$ 0
Bad debt expense	0	0
Inventory Write-down	0
Revenues from sale of product	2,673,000	$ 3,646,000
ATU [Member]
Significant Accounting Policies [Line Items]
Revenues from sale of product	$ 0