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v3.19.1

ACCOUNTS RECEIVABLE, NET (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥)
ACCOUNTS RECEIVABLE, NET |  |  |  |  |  |
Accounts receivable |  |  |  | ¥ 21,667 |  | ¥ 25,257
Less: Allowance for doubtful accounts |  | ¥ (746) | ¥ (746) | (3,535) |  | (746)
Accounts receivable, net |  |  |  | ¥ 18,132 | $ 2,637 | ¥ 24,511
Allowance for doubtful accounts: |  |  |  |  |  |
Balance at beginning of year |  | (746) | 0 |  |  |
Addition | [1] | (4,616) | (746) |  |  |
Written off | [1] | 1,827 | 0 |  |  |
Balance at end of year |  | ¥ (3,535) | ¥ (746) |  |  |
[1] | Full provision was provided to receivables due from different customers due to the remote collectability, and certain provision was written off after all collection efforts have been exhausted and the potential for recovery was remote.

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + 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(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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