Warrants - Schedule Of Fair Value Measurement Inputs and Valuation Techniques Used In Determining Warrant Liability (Detail) - Liability Classified Warrant [member]	Dec. 31, 2020	Dec. 31, 2019
Volatility | Maximum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	79.10	123.64
Volatility | Minimum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	72.19	117.43
Remaining Term | Maximum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	4.39	4.86
Remaining Term | Minimum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	1.78	2.78
Risk Free Rate | Maximum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	0.28	1.69
Risk Free Rate | Minimum [member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	0.20	1.68