Fair Value Measurements - Assumption Used to Determine Fair Value of Warrant Liability (Detail)	Jun. 30, 2022 yr	Dec. 31, 2021 yr
2017 Warrants [Member] \| Expected Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of warrant liability	1.463	0.565
2017 Warrants [Member] \| Remaining Contractual term (in years) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of warrant liability	0.08	0.58
2017 Warrants [Member] \| Risk-free Interest Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of warrant liability	0.0128	0.0019
2020 Warrants [Member] \| Expected Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of warrant liability	0.846	0.619
2020 Warrants [Member] \| Remaining Contractual term (in years) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of warrant liability	0.92	1.42
2020 Warrants [Member] \| Risk-free Interest Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value of warrant liability	0.028	0.0056