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ORDINARY SHARES (Details) $ / shares in Units, ¥ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 12, 2021 shares | Oct. 06, 2020 USD ($) shares | Jul. 23, 2020 CNY (¥) shares | Jun. 30, 2021 $ / shares shares | Mar. 31, 2022 $ / shares shares | Mar. 31, 2021 CNY (¥) shares | Mar. 31, 2021 $ / shares shares | Jul. 23, 2020 USD ($) | Mar. 31, 2020 $ / shares shares | Dec. 31, 2019 $ / shares shares | Jun. 10, 2019 USD ($) | Dec. 31, 2018 $ / shares shares
ORDINARY SHARES |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares authorized (in shares) |  |  |  |  | 9,000,000,000 |  | 10,000,000,000 |  |  |  |  |
Ordinary shares par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.0001 |  | $ 0.0001 |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001
Ordinary shares issued (in shares) |  |  |  |  | 1,186,854,720 |  | 1,112,431,559 |  | 887,667,457 | 887,617,391 |  | 880,659,899
Ordinary shares, voting rights |  |  |  |  | Each Class B ordinary share was entitled to 10 votes, while each Class A ordinary shares was entitled to one vote. |  |  |  |  |  |  |
Inducement charge | ¥ |  |  |  |  |  | ¥ 121,056 |  |  |  |  |  |
Aggregate purchase price | ¥ |  |  |  |  |  | ¥ 169,499 |  |  |  |  |  |
Convertible Note Purchase Agreement With Pacific Bridget Overseas Pionner 1 |  |  |  |  |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |  |  |  |  |
Face value of debt | $ |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |
Inducement charge | ¥ |  |  | ¥ 121,100 |  |  |  |  |  |  |  |  |
Supplemental agreement with 2024 Notes holders |  |  |  |  |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |  |  |  |  |
Face value of debt | $ |  |  |  |  |  |  |  |  |  |  | $ 230,000,000 |
Percentage of outstanding principal |  |  |  | 30.00% |  |  |  |  |  |  |  |
Class A Ordinary Shares |  |  |  |  |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) |  |  |  |  | 1,146,044,859 |  | 1,071,621,698 |  | 846,857,596 | 846,807,530 |  | 839,850,038
Ordinary shares outstanding (in shares) |  |  |  |  | 1,146,044,859 |  | 1,071,621,698 |  | 846,857,596 | 846,807,530 |  | 839,850,038
Class A Ordinary Shares | Convertible Note Purchase Agreement With Pacific Bridget Overseas Pionner 1 |  |  |  |  |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes (in shares) |  |  | 136,279,973 |  |  |  |  |  |  |  |  |
Class A Ordinary Shares | Supplemental agreement with 2024 Notes holders |  |  |  |  |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible notes (in shares) | 66,990,291 |  |  | 66,990,291 |  |  |  |  |  |  |  |
Conversion price | $ / shares |  |  |  | $ 1.03 |  |  |  |  |  |  |  |
Class A Ordinary Shares | Private Placement |  |  |  |  |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  | 84,692,839 |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |
Class B ordinary shares |  |  |  |  |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) |  |  |  |  | 40,809,861 |  | 40,809,861 |  |  | 40,809,861 |  | 40,809,861
Ordinary shares outstanding (in shares) |  |  |  |  | 40,809,861 |  | 40,809,861 |  | 40,809,861 | 40,809,861 |  | 40,809,861
Ordinary share |  |  |  |  |  |  |  |  |  |  |  |
ORDINARY SHARES |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares outstanding (in shares) |  |  |  |  | 1,186,854,720 |  | 1,112,431,559 |  | 887,667,457 | 887,617,391 |  | 880,659,899
Conversion of convertible notes (in shares) |  |  |  |  | 66,990,291 | 136,279,973 |  |  |  |  |  |
Number of shares issued |  |  |  |  |  | 84,692,839 |  |  |  |  |  |
Aggregate purchase price | ¥ |  |  |  |  |  | ¥ 57 |  |  |  |  |  |

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