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SHARE-BASED COMPENSATION - Share option valuation (Details) - ¥ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2019
Outstanding weighted average share options
SHARE-BASED COMPENSATION
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Contractual term (in years)	10 years	10 years	10 years	10 years
Outstanding weighted average share options | Minimum
SHARE-BASED COMPENSATION
Expected volatility	46.00%	34.00%	48.00%	44.00%
Risk free interest rate (per annum)	0.30%	0.00%	0.00%	1.60%
Exercise multiple	2.8	2.8	2.8	2.8
Outstanding weighted average share options | Maximum
SHARE-BASED COMPENSATION
Expected volatility	49.00%	68.00%	61.00%	45.00%
Risk free interest rate (per annum)	0.70%	2.40%	1.40%	1.90%
Exercise multiple	2.2	2.2	2.2	2.2
Non-vested restricted shares
Number of restricted stock
Unvested at the beginning of the period (in shares)	33,334	0	33,334	133,334
Granted (in shares)	50,066	606,570	275,850	151,655
Vested (in shares)	(50,066)	(606,570)	(309,184)	(184,988)
Forfeited (in shares)				66,667
Unvested the end of the period (in shares)	33,334	0	0	33,334
Weighted-average grant date fair value per share
Unvested at the beginning of the period (in dollars per share)	¥ 2.26		¥ 2.26	¥ 2.26
Granted (in dollars per share)	0.51	¥ 0.42	0.45	1.41
Vested (in dollars per share)	0.51	¥ 0.42	¥ 0.65	0.75
Forfeited (in dollars per share)				2.26
Unvested restricted common stock at the end of the period (in dollars per share)	¥ 2.26			¥ 2.26

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(03)
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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X

- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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X

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The exercise multiple assumption that is used in valuing an option on its own shares.

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