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Common stock and non-redeemable convertible preferred stock -Schedule of non-redeemable convertible preferred shares (Detail) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Schedule OfNonRedeemable Convertible Preferred Shares [Line Items]    
Preferred stock, issued (in shares) 137,765,828 137,765,828
Preferred stock, outstanding (in shares) 137,765,828 137,765,828
Class A non redeemable convertible preferred stock    
Schedule OfNonRedeemable Convertible Preferred Shares [Line Items]    
Preferred stock, issued (in shares) 27,065,219 27,065,219
Preferred stock, outstanding (in shares) 27,065,219 27,065,219
Original issue price $ 1.75 $ 1.75
Carrying value $ 47,336,000 $ 47,336,000
Class B1 Non redeemable Convertible Preferred Stock [Member]    
Schedule OfNonRedeemable Convertible Preferred Shares [Line Items]    
Preferred stock, issued (in shares) 52,700,609 52,700,609
Preferred stock, outstanding (in shares) 52,700,609 52,700,609
Original issue price $ 1.75 $ 1.75
Carrying value $ 119,977,000 $ 119,977,000
Class B2 Non redeemable Convertible Preferred Stock [Member]    
Schedule OfNonRedeemable Convertible Preferred Shares [Line Items]    
Preferred stock, issued (in shares) 29,000,000 29,000,000
Preferred stock, outstanding (in shares) 29,000,000 29,000,000
Original issue price $ 1.75 $ 1.75
Carrying value $ 23,000,000 $ 23,000,000
Class B3 Non redeemable Convertible Preferred Stock [Member]    
Schedule OfNonRedeemable Convertible Preferred Shares [Line Items]    
Preferred stock, issued (in shares) 29,000,000 29,000,000
Preferred stock, outstanding (in shares) 29,000,000 29,000,000
Original issue price $ 0.00001 $ 0.00001
Carrying value $ 290 $ 290
Nonredeemable Convertible Preferred Stock [Member]    
Schedule OfNonRedeemable Convertible Preferred Shares [Line Items]    
Carrying value 189,881,000 189,881,000
Issuance Cost $ (432,000) $ (432,000)