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Common stock and non-redeemable convertible preferred stock -Schedule of&#160;non-redeemable convertible preferred shares (Detail) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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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)

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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 + Details
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