Fair Value Measurements - Summary of Changes in Fair Values Level Financial Liabilities Recurring Basis Using Unobservable Inputs (Detail) - USD ($) $ in Thousands	12 Months Ended			24 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Changes in fair value	$ 0	$ 16,240	$ 20,926
Securities issuance obligation		10,500	1,500
Reclassification of warrant liabilities to equity		62,175
Fair Value Measurements Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Balance, beginning		56,420		$ 56,420
Changes in fair value		17,725		17,725
Settlement of financial liabilities by securities issuance		(11,970)		(11,970)
Reclassification of warrant liabilities to equity		(62,175)		(62,175)
Balance, at end			56,420
Series A Warrant [Member] | Fair Value Measurements Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Balance, beginning		32,616		32,616
Changes in fair value		11,597		11,597
Reclassification to equity		(44,213)		(44,213)
Balance, at end			32,616
Series B Warrant [Member] | Fair Value Measurements Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Balance, beginning		13,319		13,319
Changes in fair value		4,643		4,643
Reclassification to equity		(17,962)		(17,962)
Balance, at end			13,319
Warrant Issuance Obligation [Member] | Fair Value Measurements Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Balance, beginning		3,036		3,036
Securities issuance obligation		152		152
Settlement of financial liabilities by securities issuance		(3,188)		(3,188)
Balance, at end			3,036
Common stock Issuance Obligation [Member] | Fair Value Measurements Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Balance, beginning		7,449		7,449
Securities issuance obligation		1,333		1,333
Settlement of financial liabilities by securities issuance		$ (8,782)		$ (8,782)
Balance, at end			$ 7,449