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

Fair Value of Financial Instruments - Schedule of Quantitative Information Associated with the Fair Value Measurement (Detail)

v3.21.2
Fair Value of Financial Instruments - Schedule of Quantitative Information Associated with the Fair Value Measurement (Detail) - Fair Value, Recurring [Member]
$ in Thousands
 6 Months Ended
Jun. 30, 2021
USD ($)
yr
d
shares
Class A Common Stock Warrants [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair Value | $ $ 32,889
Valuation Methodology Option Pricing Method (“OPM”)
Class A Common Stock Warrants [Member] | Merger [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Transaction Merger
Probability of Occurrence 90.00%
Class A Common Stock Warrants [Member] | Other [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Transaction Other
Probability of Occurrence 10.00%
Class A Common Stock Warrants [Member] | Measurement Input, Maturity [Member] | Merger [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 0.17
Class A Common Stock Warrants [Member] | Measurement Input, Maturity [Member] | Other [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 0.17
Series B Preferred Stock Warrants [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair Value | $ $ 1,106
Valuation Methodology Black-Scholes Option Pricing Model
Series B Preferred Stock Warrants [Member] | Measurement Input, Share Price [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input | shares 1.1140
Series B Preferred Stock Warrants [Member] | Measurement Input, Exercise Price [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input | shares 0.0100
Series B Preferred Stock Warrants [Member] | Measurement Input, Expected Term [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 0.17
Series B Preferred Stock Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input | d 0.05
Series B Preferred Stock Warrants [Member] | Measurement Input, Price Volatility [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input | d 50.0
Series C Preferred Stock Warrants [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair Value | $ $ 70
Valuation Methodology Black-Scholes Option Pricing Model
Series C Preferred Stock Warrants [Member] | Measurement Input, Share Price [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input | shares 4.6506
Series C Preferred Stock Warrants [Member] | Measurement Input, Exercise Price [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input | shares 4.3177
Series C Preferred Stock Warrants [Member] | Measurement Input, Expected Term [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 0.17
Series C Preferred Stock Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 0.05
Series C Preferred Stock Warrants [Member] | Measurement Input, Price Volatility [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 15.0
Convertible Bridge Notes [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair Value | $ $ 77,574
Valuation Methodology Probability-Weighted Payoff Approach
Convertible Bridge Notes [Member] | Merger [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Transaction Merger
Probability of Occurrence 90.00%
Convertible Bridge Notes [Member] | Maturity [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Transaction Maturity
Probability of Occurrence 5.00%
Convertible Bridge Notes [Member] | Other [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Transaction Other
Probability of Occurrence 5.00%
Convertible Bridge Notes [Member] | Measurement Input, Maturity [Member] | Merger [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 0.17
Convertible Bridge Notes [Member] | Measurement Input, Maturity [Member] | Maturity [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 3.84
Convertible Bridge Notes [Member] | Measurement Input, Maturity [Member] | Minimum [Member] | Other [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 0.17
Convertible Bridge Notes [Member] | Measurement Input, Discount Rate [Member] | Merger [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 6.9
Convertible Bridge Notes [Member] | Measurement Input, Discount Rate [Member] | Maturity [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 8.2
Convertible Bridge Notes [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member] | Other [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 7.0
Convertible Bridge Notes [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member] | Other [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 6.9
Convertible Bridge Notes [Member] | Measurement Input, Expected Term [Member] | Maximum [Member] | Other [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 0.34
Consent Fee Liability [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair Value | $ $ 2,983
Valuation Methodology Probability-Weighted Payoff Approach
Consent Fee Liability [Member] | Merger [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Transaction Merger
Probability of Occurrence 90.00%
Consent Fee Liability [Member] | Maturity [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Transaction Maturity
Probability of Occurrence 5.00%
Consent Fee Liability [Member] | Other [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Transaction Other
Probability of Occurrence 5.00%
Consent Fee Liability [Member] | Measurement Input, Maturity [Member] | Merger [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 0.17
Consent Fee Liability [Member] | Measurement Input, Maturity [Member] | Maturity [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 3.84
Consent Fee Liability [Member] | Measurement Input, Maturity [Member] | Maximum [Member] | Other [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 0.34
Consent Fee Liability [Member] | Measurement Input, Maturity [Member] | Minimum [Member] | Other [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 0.17
Consent Fee Liability [Member] | Measurement Input, Discount Rate [Member] | Merger [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 6.9
Consent Fee Liability [Member] | Measurement Input, Discount Rate [Member] | Maturity [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 8.2
Consent Fee Liability [Member] | Measurement Input, Discount Rate [Member] | Other [Member]  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Derivative Liability, Measurement Input 6.9