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ORDINARY SHARES PURCHASE WARRANTS ISSUED TO INVESTORS - Measurement inputs (Details) | Dec. 31, 2021 ¥ / shares | Jun. 30, 2021 ¥ / shares | Jun. 14, 2021 ¥ / shares | Jun. 26, 2020 | May 21, 2020
--- | --- | --- | --- | --- | ---
Stock price |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Warrants outstanding, measurement input | 1.31 | 4.33 | 5.01 |  |
Risk-free interest rate |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Warrants outstanding, measurement input | 1.25 | 0.95 | 0.90 | 0.35 | 0.40
Volatility |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Warrants outstanding, measurement input | 109 | 111 | 111 | 104.26 | 99.50
Exercise price |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Warrants outstanding, measurement input | 6.24 | 6.24 | 6.24 |  |
Warrant life |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |
Warrants outstanding, measurement input | 5.0 | 5.5 | 5.5 |  |

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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