WARRANTS - Summary of Assumptions to Use Option Pricing Model (Detail)	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2018
Common Stock Warrants | 2018 Direct Registered Offering | Expected term (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs			7.0
Common Stock Warrants | 2018 Direct Registered Offering | Expected volatility (%)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs			0.625
Common Stock Warrants | 2018 Direct Registered Offering | Risk-free interest rate (%)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs			0.028
Common Stock Warrants | 2018 Direct Registered Offering | Expected dividend yield (%)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs			0
2017 Placement Warrants | Expected term (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs	1.8	2.0
2017 Placement Warrants | Expected volatility (%)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs	0.850	0.860
2017 Placement Warrants | Risk-free interest rate (%)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs	0.022	0.004
2017 Placement Warrants | Expected dividend yield (%)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs	0	0
2016 Placement Warrants | Expected term (in years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs	1.4	1.6
2016 Placement Warrants | Expected volatility (%)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs	0.846	0.855
2016 Placement Warrants | Risk-free interest rate (%)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs	0.019	0.003
2016 Placement Warrants | Expected dividend yield (%)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants, fair value measurement inputs	0	0