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ORDINARY SHARES (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Nov. 06, 2020 CNY (¥) shares | Nov. 02, 2020 $ / shares shares | Dec. 10, 2019 CNY (¥) shares | Dec. 10, 2019 USD ($) shares | Mar. 19, 2019 CNY (¥) shares | Mar. 19, 2019 USD ($) shares | Jan. 29, 2018 CNY (¥) shares | Jan. 29, 2018 USD ($) shares | Jan. 26, 2018 $ / shares shares | Jun. 30, 2020 CNY (¥) item shares | Jun. 30, 2020 USD ($) item $ / shares shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2018 CNY (¥)
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares | ¥ |  |  |  |  |  |  |  |  |  |  |  | ¥ 15,974,517 | ¥ 4,934,126 | ¥ 1,283,308
Proceeds from offering, net of underwriting discounts and commissions and other issuance costs | ¥ 12,441,232 |  | ¥ 1,951,884 | $ 277,256 | ¥ 2,982,242 | $ 444,699 | ¥ 1,283,308 | $ 202,696 |  |  |  |  |  |
IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ / shares |  | $ 80.88 |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share (in USD/share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 8.125 |  |  |
Proceeds from offering, net of underwriting discounts and commissions and other issuance costs |  |  |  |  |  |  |  |  |  | ¥ 3,533,285 | $ 500,784 |  |  |
Number of investors | item |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |
ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) |  |  | 6,318,680 | 6,318,680 | 13,731,343 | 13,731,343 |  |  | 8,000,000 |  |  |  |  |
ADS | IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
ADS | Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) | 3,000,000 |  | 824,175 | 824,175 | 1,791,044 | 1,791,044 | 225,000 | 225,000 |  |  |  |  |  |
ADS | Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 65 |  |  |
Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) |  |  | 50,549,440 | 50,549,440 | 109,850,744 | 109,850,744 |  |  | 64,000,000 |  |  |  |  |
Common stock, outstanding shares (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,427,590,059 | 1,148,842,379 |
Class A | IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) |  | 160,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Class A | Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) | 24,000,000 |  | 6,593,400 | 6,593,400 | 14,328,352 | 14,328,352 | 1,800,000 | 1,800,000 |  |  |  |  |  |
Class A | Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares issued (in shares) |  |  |  |  |  |  |  |  |  | 62,153,848 | 62,153,848 |  |  |
Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, outstanding shares (in shares) |  |  |  |  |  |  |  |  |  |  |  | 67,590,336 | 67,590,336 |
SBCVC | ADS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  |  |  | $ 26.00 |  |  |  |  |
SBCVC | ADS | Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold |  |  |  |  |  |  | 1,425,000 | 1,425,000 |  |  |  |  |  |
SBCVC | Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold |  |  |  |  |  |  |  |  | 24,000,000 |  |  |  |  |
SBCVC | Class A | Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold |  |  |  |  |  |  | 11,400,000 | 11,400,000 |  |  |  |  |  |
Hillhouse | Class A | Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares | $ |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |
STT GDC | Class A | Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares | $ |  |  |  |  |  |  |  |  |  |  | $ 105,000 |  |  |

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