Schedule of Assumptions Used to Calculate Fair Value of Warrant Liability (Detail)	Jun. 30, 2021	Jun. 30, 2021 yr	Jun. 30, 2021 UsdShare	Jun. 30, 2020 UsdShare yr
Risk Free Interest Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	0.2			0.2
Expected life years
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input | yr				2.9
Expected volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	88.5	1.9		77.4
Dividend Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input	0.0			0.0
Black-Scholes Fair Value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants and Rights Outstanding, Measurement Input | UsdShare			1.39	2.52