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SHORT TERM INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2018
Short-term Investments [Abstract] |
Schedule of amortized cost, gross unrecognized holding gains and losses, gross unrealized gain in accumulated other comprehensive income, and estimated fair value of investments | The amortized cost, gross unrealized gain in accumulated other comprehensive income, and estimated fair value of investments as of December 31, 2017 and 2018, are reflected in the tables below:
|  | As of December 31, 2017 |
|  | Amortized Cost |  |  | Gross unrealized gain in accumulated other comprehensive income |  |  | Estimated Fair value |
|  | RMB |  |  | RMB |  |  | RMB |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity investments |  |  |  |  |  |  |  |  |  |  |  |
Fixed-rate financial products |  |  | 93,000 |  |  |  | - |  |  |  | 93,000 |
Available-for-sale investments |  |  |  |  |  |  |  |  |  |  |  |
Adjustable-rate financial products |  |  | 128,000 |  |  |  | 42 |  |  |  | 128,042 |
|  | As of December 31, 2018 |
|  | Amortized Cost |  |  | Gross unrealized gain in accumulated other comprehensive income |  |  | Estimated Fair value |
|  | RMB |  |  | RMB |  |  | RMB |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity investments |  |  |  |  |  |  |  |  |  |  |  |
Fixed-rate financial products |  |  | 70,000 |  |  |  | - |  |  |  | 70,000 |
Available-for-sale investments |  |  |  |  |  |  |  |  |  |  |  |
Adjustable-rate financial products |  |  | 47,000 |  |  |  | 208 |  |  |  | 47,208 |
Schedule of interest income recognized on held-to-maturity investments | Interest income recognized on held-to-maturity investments for years ended December 31, 2016, 2017 and 2018 were as follows:
|  | Year Ended December 31, |
|  | 2016 |  |  | 2017 |  |  | 2018 |  |  | 2018 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | USD |
Interest income recognized on held-to-maturity investments |  |  | 4,078 |  |  |  | 3,799 |  |  |  | 5,836 |  |  |  | 849 |

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- Definition Tabular disclosure of investment income, including, but not limited to, interest and dividend income and amortization of discount (premium) derived from debt and equity securities. Excludes realized and unrealized gain (loss) on investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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