DARPA Grant Revenue - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Revenue Reconciling Item [Line Items]
Allowable costs of reimbursable		$ 5,000
Prepaid expenses and other current assets			$ 1,245		$ 1,245		$ 3,194
Reimbursable for allowable costs			1,500		1,500
Maximum [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Reimbursement Amount	$ 5,000
DARPA Grant Revenue [Member]
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues			2,000	$ 700	2,000	$ 700
Prepaid expenses and other current assets			$ 400		$ 400		$ 100