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DESCRIPTION OF BUSINESS, ORGANIZATION, BASIS OF PRESENTATION AND SIGNIFICANT CONCENTRATIONS AND RISKS (Significant Concentrations and Risks) (Details) - Net revenues [Member] | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Product concentration [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 75.00% | 65.20% | 65.80%
Product concentration [Member] | Java [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 34.30% | 28.80% | 36.70%
Product concentration [Member] | Digital Arts [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 28.00% | 32.20% | 29.10%
Product concentration [Member] | Web Front [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 12.70% | 4.20% | 0.00%
Geographic concentration [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 44.30% | 45.30% | 41.00%
Geographic concentration [Member] | Beijing [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 12.40% | 12.30% | 15.50%
Geographic concentration [Member] | Hangzhou [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration percentage | 31.90% | 33.00% | 25.50%

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