General form of registration statement for all companies including face-amount certificate companies

Stock Warrants - Summary of Black- Scholes model using the following inputs (Detail)

v3.21.2
Stock Warrants - Summary of Black- Scholes model using the following inputs (Detail) - Fair Value, Inputs, Level 3 [Member] - Warrant [Member]
Jun. 30, 2021
yr
Dec. 31, 2020
yr
Jun. 30, 2020
yr
Dec. 31, 2019
yr
Expected (remaining) option term (in years)        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative Liability, Measurement Input 3.69 4.13 4.64 5.14
Expected volatility        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative Liability, Measurement Input 65.0 55.4 54.3 52.4
Risk-free interest rate        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative Liability, Measurement Input 0.45 0.36 0.29 1.69
Expected dividend yield        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative Liability, Measurement Input 0 0 0 0
Fair value of common stock (per share)        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Derivative Liability, Measurement Input 9.51 2.93 2.07 2.00