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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
	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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+ References

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
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-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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