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Operations and Reorganization - Initial public offering ("IPO") and followed offerings (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 CNY (¥) | Jun. 30, 2020 USD ($) | Apr. 30, 2020 CNY (¥) shares | Apr. 30, 2020 USD ($) shares | Apr. 30, 2019 CNY (¥) shares | Apr. 30, 2019 USD ($) $ / shares shares | Oct. 31, 2018 CNY (¥) shares | Oct. 31, 2018 USD ($) shares | Apr. 30, 2018 CNY (¥) shares | Apr. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) shares
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the offering, after deducting offerings expenses |  |  |  |  |  |  |  |  |  |  | ¥ 2,817,458 | $ 431,794 | ¥ 1,647,711 |  | ¥ 4,952,606
Convertible senior notes aggregate principal amount | ¥ |  |  |  |  |  |  |  |  |  |  | 8,482,370 |  | 3,488,100 |  |
Convertible senior notes (the "2026 Notes") due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes aggregate principal amount | $ |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |
Convertible senior notes (the "2027 Notes") due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the offering, after deducting commissions and offerings expenses |  |  |  |  |  |  |  |  |  |  | ¥ 5,594,800 | $ 786,100 |  |  |
Convertible senior notes aggregate principal amount | $ |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes And Primary Offering [Member] | Convertible senior notes (the "2027 Notes") due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock and notes issued net of issuance cost |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 5,003,800 | $ 733,900 |
Class Z Ordinary Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, issued (in shares) |  |  | 17,310,696 | 17,310,696 |  |  | 25,063,451 | 25,063,451 | 42,000,000 | 42,000,000 |  |  |  |  |
Class Z Ordinary Shares | Convertible senior notes (the "2027 Notes") due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, issued (in shares) |  |  |  |  |  |  |  |  |  |  | 17,310,696 | 17,310,696 |  |  |
Net proceeds from the offering, after deducting offerings expenses |  |  |  |  |  |  |  |  |  |  | ¥ 2,817,500 | $ 399,400 |  |  |
Class Z Ordinary Shares | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, issued (in shares) |  |  |  |  |  |  |  |  | 42,000,000 | 42,000,000 |  |  |  |  | 25,063,451
ADSs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, issued (in shares) |  |  | 17,310,696 | 17,310,696 |  |  | 25,063,451 | 25,063,451 |  |  |  |  |  |  |
ADSs | Convertible senior notes (the "2026 Notes") due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, issued (in shares) |  |  |  |  | 14,173,813 | 14,173,813 |  |  |  |  |  |  |  |  |
ADSs | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, issued (in shares) |  |  |  |  |  |  |  |  | 42,000,000 | 42,000,000 |  |  |  |  |
Price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 11.50 |  |  |  |  |
American Depository Shares Class Z Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary shares, issued (in shares) |  |  |  |  |  |  |  |  | 42,000,000 | 42,000,000 |  |  |  |  |
Price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 11.50 |  |  |  |  |
Net proceeds from the offering, after deducting offerings expenses |  |  | ¥ 2,817,500 | $ 399,400 |  |  | ¥ 2,170,800 | $ 317,200 |  |  |  |  |  |  |
Proceeds from common stock and notes issued net of issuance cost |  |  |  |  | ¥ 1,647,700 | $ 245,700 |  |  |  |  |  |  |  |  |
American Depository Shares Class Z Common Stock | Convertible senior notes (the "2027 Notes") due 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from common stock and notes issued net of issuance cost | ¥ 5,594,800 | $ 786,100 |  |  |  |  |  |  |  |  |  |  |  |  |
American Depository Shares Class Z Common Stock | Notes And Primary Offering [Member] | Convertible senior notes (the "2026 Notes") due 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share | $ / shares |  |  |  |  |  | $ 18.00 |  |  |  |  |  |  |  |  |
Proceeds from common stock and notes issued net of issuance cost |  |  |  |  | ¥ 733,900 | $ 5,003,800 |  |  |  |  |  |  |  |  |
American Depository Shares Class Z Common Stock | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operations and Reorganization [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the offering, after deducting commissions and offerings expenses |  |  |  |  |  |  |  |  | ¥ 2,781,800 | $ 443,300 |  |  |  |  |

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