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CONDENSED FINANCIAL INFORMATION OF THE PARENT COMPANY - Balance sheets (Details) ¥ in Thousands, $ in Thousands | Mar. 31, 2022 CNY (¥) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥) | Mar. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
--- | --- | --- | --- | --- | --- | --- | ---
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 128,021 | $ 20,195 | ¥ 192,605 | ¥ 342,504 |  | ¥ 478,200 |
Other receivables | 166,006 | 26,187 | 110,025 |  |  |  |
Total assets | 1,251,199 | 197,372 | 1,233,533 |  |  |  |
Current liabilities |  |  |  |  |  |  |
Other payables and other current liabilities | 674,333 | 106,373 | 894,565 |  |  |  |
Warrant liabilities | 196,390 | 30,980 |  |  |  |  |
Total liabilities | 2,234,798 | 352,531 | 3,229,388 |  |  |  |
Mezzanine equity |  |  |  |  |  |  |
Senior convertible preferred shares (US$0.0001 par value, nil and 1,000,000,000 shares authorized as of March 31, 2021 and 2022, respectively; nil and 400,524,323 shares issued and outstanding as of March 31, 2021 and 2022, respectively) | 526,484 | 83,051 |  |  |  |  |
Total Mezzanine equity | 526,484 | 83,051 |  |  |  |  |
Shareholders' deficit |  |  |  |  |  |  |
Ordinary shares (US$0.0001 par value, 10,000,000,000 and 9,000,000,000 shares authorized as of March 31, 2021 and 2022, respectively; 1,071,621,698 Class A ordinary shares and 1,146,044,858 Class A ordinary shares issued and outstanding as of March 31, 2021 and 2022, respectively; 40,809,861 Class B ordinary shares issued and outstanding as of March 31, 2021 and 2022) | 782 | 123 | 733 |  |  |  |
Additional paid-in capital | 14,254,109 | 2,248,530 | 13,695,877 |  |  |  |
Accumulated other comprehensive income | 288,461 | 45,504 | 217,747 |  |  |  |
Accumulated deficit | (16,053,300) | (2,532,341) | (15,910,049) |  |  |  |
Total shareholders' deficit | (1,510,083) | (238,210) | (1,995,855) |  | ¥ (2,344,647) | ¥ 465,120 | ¥ 2,371,643
Total liabilities, mezzanine equity and shareholders' deficit | 1,251,199 | $ 197,372 | 1,233,533 |  |  |  |
Reportable Legal Entities | Parent Company |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents | 599 |  | 346 |  |  |  |
Amounts due from intra-Group entities | 8,438,565 |  | 8,753,029 |  |  |  |
Other receivables | 2,170 |  | 2,415 |  |  |  |
Forward contract assets | 36 |  |  |  |  |  |
Prepaid expenses | 5,104 |  | 4,189 |  |  |  |
Total assets | 8,446,474 |  | 8,759,979 |  |  |  |
Current liabilities |  |  |  |  |  |  |
Other payables and other current liabilities | 22,678 |  | 46,866 |  |  |  |
Investment deficit in subsidiaries | 9,120,730 |  | 10,618,691 |  |  |  |
Amounts due to intra-Group entities | 90,112 |  | 90,114 |  |  |  |
Warrant liabilities | 196,390 |  |  |  |  |  |
Total liabilities | 9,429,910 |  | 10,755,671 |  |  |  |
Mezzanine equity |  |  |  |  |  |  |
Senior convertible preferred shares (US$0.0001 par value, nil and 1,000,000,000 shares authorized as of March 31, 2021 and 2022, respectively; nil and 400,524,323 shares issued and outstanding as of March 31, 2021 and 2022, respectively) | 526,484 |  |  |  |  |  |
Total Mezzanine equity | 526,484 |  |  |  |  |  |
Shareholders' deficit |  |  |  |  |  |  |
Ordinary shares (US$0.0001 par value, 10,000,000,000 and 9,000,000,000 shares authorized as of March 31, 2021 and 2022, respectively; 1,071,621,698 Class A ordinary shares and 1,146,044,858 Class A ordinary shares issued and outstanding as of March 31, 2021 and 2022, respectively; 40,809,861 Class B ordinary shares issued and outstanding as of March 31, 2021 and 2022) | 782 |  | 733 |  |  |  |
Additional paid-in capital | 14,254,109 |  | 13,695,877 |  |  |  |
Accumulated other comprehensive income | 288,461 |  | 217,747 |  |  |  |
Accumulated deficit | (16,053,272) |  | (15,910,049) |  |  |  |
Total shareholders' deficit | (1,509,920) |  | (1,995,692) |  |  |  |
Total liabilities, mezzanine equity and shareholders' deficit | ¥ 8,446,474 |  | ¥ 8,759,979 |  |  |  |

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