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PARENT ONLY FINANCIAL INFORMATION - Condensed Balance Sheets (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash | ¥ 16,259,457 | ¥ 5,810,938 |  |
Prepaid expenses | 163,986 | 80,913 |  |
Other current assets | 172,579 | 148,603 |  |
Total current assets | 18,318,806 | 7,084,709 |  |
Restricted cash | 146,643 | 128,025 |  |
Other non-current assets | 486,071 | 289,410 |  |
Total assets | 57,258,795 | 31,492,531 |  |
Current liabilities |  |  |  |
Accounts payable | 3,657,112 | 1,675,966 |  |
Accrued expenses and other payables | 1,395,981 | 817,883 |  |
Total current liabilities | 7,643,821 | 3,999,514 |  |
Long-term borrowings | 10,566,746 | 8,028,473 |  |
Convertible bonds payable | 1,928,466 | 2,049,654 |  |
Other long-term liabilities | 349,257 | 345,537 |  |
Total liabilities | 30,591,073 | 20,136,969 |  |
Mezzanine Equity |  |  |  |
Redeemable preferred shares (US$0.00005 par value; 150,000 shares authorized, issued and outstanding as of December 31, 2019 and December 31, 2020, respectively; Redemption value of RMB1,061,981 and RMB980,910 as of December 31, 2019 and December 31, 2020, respectively; Liquidation value of RMB1,537,636 and RMB2,576,578 as of December 31, 2019 and December 31, 2020, respectively) | 980,910 | 1,061,981 |  |
Total mezzanine equity | 1,101,730 | 1,061,981 |  |
Shareholders' Equity |  |  |  |
Ordinary shares (US$0.00005 par value; 2,002,000,000 authorized; 1,148,842,379 and 1,427,590,059 Class A ordinary shares issued and outstanding as of December 31, 2019 and 2020, respectively; 67,590,336 Class B ordinary shares issued and outstanding as of December 31, 2019 and 2020, respectively) | 507 | 412 |  |
Additional paid-in capital | 28,728,717 | 12,403,043 |  |
Accumulated other comprehensive loss | (439,635) | (52,684) |  |
Accumulated deficit | (2,723,597) | (2,057,190) |  |
Total shareholders' equity | 25,565,992 | 10,293,581 | ¥ 5,521,925 | ¥ 4,475,512
Commitments and contingencies |  |  |  |
Total liabilities, mezzanine equity and shareholders' equity | 57,258,795 | 31,492,531 |  |
Parent Company | Reportable Legal Entities |  |  |  |
Current assets |  |  |  |
Cash | 12,312,249 | 2,560,388 |  |
Prepaid expenses | 39,187 | 7,048 |  |
Other current assets | 23,136 | 21,537 |  |
Total current assets | 12,374,572 | 2,588,973 |  |
Restricted cash |  | 27,225 |  |
Investment and loans to subsidiaries | 16,146,058 | 11,539,590 |  |
Other non-current assets | 3,616 | 4,954 |  |
Total assets | 28,524,246 | 14,160,742 |  |
Current liabilities |  |  |  |
Accounts payable | 12,451 | 7,168 |  |
Accrued expenses and other payables | 29,790 | 49,546 |  |
Due to subsidiaries | 868 | 928 |  |
Total current liabilities | 43,109 | 57,642 |  |
Long-term borrowings |  | 681,235 |  |
Convertible bonds payable | 1,928,466 | 2,049,654 |  |
Other long-term liabilities | 5,769 | 16,649 |  |
Total liabilities | 1,977,344 | 2,805,180 |  |
Mezzanine Equity |  |  |  |
Redeemable preferred shares (US$0.00005 par value; 150,000 shares authorized, issued and outstanding as of December 31, 2019 and December 31, 2020, respectively; Redemption value of RMB1,061,981 and RMB980,910 as of December 31, 2019 and December 31, 2020, respectively; Liquidation value of RMB1,537,636 and RMB2,576,578 as of December 31, 2019 and December 31, 2020, respectively) | 980,910 | 1,061,981 |  |
Total mezzanine equity | 980,910 | 1,061,981 |  |
Shareholders' Equity |  |  |  |
Ordinary shares (US$0.00005 par value; 2,002,000,000 authorized; 1,148,842,379 and 1,427,590,059 Class A ordinary shares issued and outstanding as of December 31, 2019 and 2020, respectively; 67,590,336 Class B ordinary shares issued and outstanding as of December 31, 2019 and 2020, respectively) | 507 | 412 |  |
Additional paid-in capital | 28,728,717 | 12,403,043 |  |
Accumulated other comprehensive loss | (439,635) | (52,684) |  |
Accumulated deficit | (2,723,597) | (2,057,190) |  |
Total shareholders' equity | 25,565,992 | 10,293,581 |  |
Total liabilities, mezzanine equity and shareholders' equity | ¥ 28,524,246 | ¥ 14,160,742 |  |

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