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

Subsequent Events -Summary of Common Stock and Warrants Issued Under 2021 Bridge Financing (Detail)

v3.21.2
Subsequent Events -Summary of Common Stock and Warrants Issued Under 2021 Bridge Financing (Detail) - shares
shares in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Class A Common Stock Warrants [Member]    
Subsequent Event [Line Items]    
Class A Common Stock warrants   43,030
Class A Common Stock Warrants [Member] | Two Thousand and Twenty One Bridge Notes [Member]    
Subsequent Event [Line Items]    
Class A Common Stock warrants   43,030
Common Class A [Member]    
Subsequent Event [Line Items]    
Class A Common Stock 223,054 219,614
Common Class A [Member] | Two Thousand and Twenty One Bridge Notes [Member]    
Subsequent Event [Line Items]    
Class A Common Stock   126,572
Common Class A [Member] | SVB Line Of Credit [Member]    
Subsequent Event [Line Items]    
Class A Common Stock   93,042