Threshold number of specified days to determine the additional interest liable to pay on convertible debt instruments.

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Threshold percentage of principal value repayable in the event of default of restructuring agreement.

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Amount of restructuring under notes consideration.

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Percentage of Note Holders or Third Parties to Vote in Favour of the Scheme in Terms of Aggregate Principal Amount.

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Represents the percentage of principal and accrued and unpaid interest on Notes which will automatically become immediately due and payable.

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The number of new stock issued during the period including stock issued under top up scheme to creditors.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of interest payable on debt, including, but not limited to, trade payables.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Number of new stock issued during the period.

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CONVERTIBLE SENIOR NOTES (Details) ¥ in Thousands, $ in Thousands							1 Months Ended	12 Months Ended
	Apr. 04, 2022 shares	Jan. 28, 2022 USD ($) shares	Dec. 01, 2021	Jul. 15, 2020	Jan. 17, 2020 USD ($)	Jan. 14, 2020 USD ($)	Dec. 31, 2019 shares	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Net proceeds from Notes Offering \| ¥										¥ 3,098,069
Interest expenses								¥ 35,490	$ 5,569	¥ 107,014
Percentage of aggregate principal amount of creditors to approve the scheme			97.70%
Convertible senior notes due 2025
Debt Instrument [Line Items]
Net proceeds from Notes Offering					$ 449,654
Beneficial conversion feature						$ 0
Additional interest rate				0.50%
Aggregate principal amount					$ 60,000	$ 400,000
Total amount due									469,909		$ 464,412
Interest expenses									$ 5,497		15,362
Class A ordinary shares
Debt Instrument [Line Items]
Issuance of shares (in shares) \| shares							19,753,888
Class A ordinary shares \| Subsequent event
Debt Instrument [Line Items]
Issuance of shares (in shares) \| shares	2,333,592
ADSs \| Subsequent event
Debt Instrument [Line Items]
Issuance of shares (in shares) \| shares	291,699
Restructuring Support Agreement \| Convertible senior notes due 2025
Debt Instrument [Line Items]
Percentage of principal and accrued and unpaid interest on Notes which automatically became due and payable								100.00%	100.00%
Threshold number of days for additional interest				380 days
Additional interest payable									$ 2,083		1,071
Percentage of principal of notes upon default								100.00%	100.00%
Aggregate principal amount									$ 460,000
Accrued and unpaid interest									6,826		3,341
Interest expenses									$ 2,012		$ 1,071
Restructuring Support Agreement \| Subsequent event
Debt Instrument [Line Items]
Cash consideration principle amount		$ 245,455
Restructuring Support Agreement \| Subsequent event \| 9% Series B - Senior Secured Notes due 2027
Debt Instrument [Line Items]
Net proceeds from Notes Offering		$ 109,855
Additional interest rate		9.00%
Cash consideration principle amount		$ 245,455
Restructuring Support Agreement \| Class A ordinary shares \| Subsequent event
Debt Instrument [Line Items]
Issuance of shares (in shares) \| shares		73,887,216
Issuance of shares including shares issued under top-up mechanism (in shares) \| shares		76,220,808
Restructuring Support Agreement \| ADSs \| Subsequent event
Debt Instrument [Line Items]
Issuance of shares (in shares) \| shares	291,699	9,235,902
Issuance of shares including shares issued under top-up mechanism (in shares) \| shares		9,527,601