Fair Value of Financial Instruments - Summarizes the Conclusions Reached Regarding Fair Value Measurements (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Balance at January 1	$ 2,871	$ 2,601	$ 2,436
Net Change in fair value included in earnings	(1,609)	270	(827)
Purchases / Issuance			992
Balance at December 31,	1,262	2,871	2,601
Significant Unobservable Inputs (Level 3) [Member] | Warrant Liability, Related Party [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Balance at January 1	2,871	2,601	2,436
Net Change in fair value included in earnings	(1,609)	270	(827)
Purchases / Issuance			992
Balance at December 31,	1,262	2,871	$ 2,601
Fair Value, Measurements, Recurring [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Total	4,928
Total	1,262	2,871
Fair Value, Measurements, Recurring [Member] | Warrant Liability, Related Party [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Total	1,262	2,871
Fair Value, Measurements, Recurring [Member] | Equity Securities With Readily Determinable Fair Value [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Total	4,928
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Asset (Level 1) [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Total	4,928
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Asset (Level 1) [Member] | Equity Securities With Readily Determinable Fair Value [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Total	4,928
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Total	1,262	2,871
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Warrant Liability, Related Party [Member]
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]
Total	$ 1,262	$ 2,871