Summary of Significant Accounting Policies - Reconciliation of Convertible Notes Measured at Fair Value Significant Unobservable Inputs (Detail) - Convertible Notes, Level 3 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 10,131	$ 8,165
Issuance of convertible promissory notes		1,000
Accrued interest	584	813
Change in fair value of convertible promissory notes	(1,585)	153
Converted into common stock	$ (9,130)
Ending balance		$ 10,131