Fair Value Measurements - Summary of the Tranche Liability and Warrant Liability Measured at Fair Value using Level 3 Significant Unobservable Inputs (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 5,413
Change in fair value	81,157
Settlement of tranche liability due to issuance of Milestone Shares	(81,190)
Settlement of warrant liability upon exercise of warrant	(5,380)
Ending balance	0
Series B Tranche Rights
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	5,033
Change in fair value	76,157
Settlement of tranche liability due to issuance of Milestone Shares	(81,190)
Ending balance	0
Series A-1 Preferred Stock Warrant
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	380
Change in fair value	5,000
Settlement of warrant liability upon exercise of warrant	(5,380)
Ending balance	$ 0