Warrants - Schedule Of Fair Value Measurement Inputs and Valuation Techniques Used In Determining Warrant Liability (Detail) - Liability Classified Warrant [member]	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Volatility | Minimum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	0.5227	0.7219
Volatility | Maximum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	0.7530	0.7910
Remaining Term | Minimum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and rights outstanding measurement Input term	1 year 10 days	1 year 9 months 10 days
Remaining Term | Maximum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and rights outstanding measurement Input term	3 years 7 months 20 days	4 years 4 months 20 days
Risk Free Rate | Minimum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	0.0052	0.0020
Risk Free Rate | Maximum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	0.0081	0.0028