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

Fair Value of Financial Instruments - Summary of Recurring basis (Detail)

v3.21.2
Fair Value of Financial Instruments - Summary of Recurring basis (Detail) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Convertible Bridge Notes [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability $ 77,574    
Consent Fee Liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 2,983    
Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0 $ 0 $ 0
Fair Value, Inputs, Level 1 [Member] | Convertible Bridge Notes [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability [1] 0    
Fair Value, Inputs, Level 1 [Member] | Consent Fee Liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0    
Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0 0 0
Fair Value, Inputs, Level 2 [Member] | Convertible Bridge Notes [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability [1] 0    
Fair Value, Inputs, Level 2 [Member] | Consent Fee Liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0    
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 114,622 558 1
Fair Value, Inputs, Level 3 [Member] | Convertible Bridge Notes [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability [1] 77,574    
Fair Value, Inputs, Level 3 [Member] | Consent Fee Liability [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 2,983    
Series B Preferred Stock Warrants [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 1,106    
Series B Preferred Stock Warrants [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0 0 0
Series B Preferred Stock Warrants [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0 0 0
Series B Preferred Stock Warrants [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 1,106 508 1
Series C Preferred Stock Warrants [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 70    
Series C Preferred Stock Warrants [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0 0 0
Series C Preferred Stock Warrants [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0 0 0
Series C Preferred Stock Warrants [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 70 $ 50 $ 0
Class A Common Stock Warrants [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 32,889    
Class A Common Stock Warrants [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0    
Class A Common Stock Warrants [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability 0    
Class A Common Stock Warrants [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Liability $ 32,889    
[1] The Convertible Bridge Notes includes loans from Mithril II, LP in the principal amount of $15 million, VCVC in the principal of $5 million.