Leases - Schedule of Leases (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Assets
Operating lease assets	$ 2,073		$ 2,073		$ 3,081
Total leased assets	2,073		2,073		3,081
Liabilities
Current - Operating	986		986		1,074
Noncurrent - Operating	1,269		1,269		2,220
Total leased liabilities	2,255		2,255		$ 3,294
Lease Cost
Net lease cost	$ 165	$ 360	$ 543	$ 1,008
Lease Term and Discount Rate
Weighted-average remaining lease term (years)	2 years 3 months 18 days		2 years 3 months 18 days		2 years 8 months 12 days
Weighted-average discount rate	6.40%		6.40%		6.00%
SG&A and R&D Expenses [Member]
Lease Cost
Operating lease cost	$ 271	319	$ 815	955
Sublease income	(99)	(10)	(276)	(43)
R&D Expenses [Member]
Lease Cost
Short term lease cost	7	37	4	67
SG&A Expenses [Member]
Lease Cost
Short term lease cost	$ 0	$ 14	$ 0	$ 29