Fair Value Disclosures - Summary of Reconciliations of Changes In The Fair Value of The Liabilities (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Warrant Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of January 1, 2021	$ 19,700
Change in fair value	4,400
Extinguishment of the warrant and derivative liabilities	(24,100)
Balance as of September 30, 2021
Acquisition Related Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of January 1, 2021	23,155
Additions, net of payments	1,744
Change in fair value	(13)
Balance as of September 30, 2021	24,886
Derivative Liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of January 1, 2021	38,400
Change in fair value	600
Extinguishment of the warrant and derivative liabilities	(39,000)
Balance as of September 30, 2021