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Warrants - Summary of fair value of warrant liabilities (Detail)
Sep. 11, 2020
Risk-free rate of return [Member]  
Warrants and Rights Outstanding, Measurement Input 0.0012
Maturity date [Member]  
Warrants and Rights Outstanding, Maturity Date Sep. 11, 2021
Estimated volatility rate [Member]  
Warrants and Rights Outstanding, Measurement Input 0.6072
Exercise price [Member]  
Warrants and Rights Outstanding, Measurement Input 19.57