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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Value-added-tax ("VAT") (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Value-added-tax ("VAT") |  |
VAT recoverable | ¥ 155,620 | ¥ 129,994
VAT recoverable | 1,445,521 | 888,483
Current assets |  |
Value-added-tax ("VAT") |  |
VAT recoverable | 155,620 | 129,994
Noncurrent assets |  |
Value-added-tax ("VAT") |  |
VAT recoverable | 1,445,521 | 888,483
Accrued expenses and other payables |  |
Value-added-tax ("VAT") |  |
VAT payables | ¥ 6,838 | ¥ 7,886

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- Definition Carrying amount as of the balance sheet date of value added taxes due either from customers arising from sales on credit terms, or as previously overpaid to tax authorities. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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