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Organization and principal activities (Schedule of Details of Subsidiaries, VIEs and VIE's Subsidiary) (Details) | 12 Months Ended
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Dec. 31, 2015
100 Online [Member] |  |
Subsidiaries, VIEs and VIE's subsidiary [Line Items] |  |
% of direct or indirect economic ownership | 100.00% | [1]
Xingxue [Member] |  |
Subsidiaries, VIEs and VIE's subsidiary [Line Items] |  |
% of direct or indirect economic ownership | 76.90% |
Beifu [Member] |  |
Subsidiaries, VIEs and VIE's subsidiary [Line Items] |  |
% of direct or indirect economic ownership | 70.00% |
Shanghai Yilian Equity Investment Partnership LP [Member] |  |
Subsidiaries, VIEs and VIE's subsidiary [Line Items] |  |
% of direct or indirect economic ownership | 93.50% |
Guangzhou Huaduo [Member] |  |
Subsidiaries, VIEs and VIE's subsidiary [Line Items] |  |
% of direct or indirect economic ownership | 100.00% |
Duowan Entertainment Corporation [Member] |  |
Subsidiaries, VIEs and VIE's subsidiary [Line Items] |  |
% of direct or indirect economic ownership | 100.00% |
Huanju Shidai Technology Beijing Company Limited [Member] |  |
Subsidiaries, VIEs and VIE's subsidiary [Line Items] |  |
% of direct or indirect economic ownership | 100.00% |
Zhuhai Duowan or Guangzhou Duowan [Member] |  |
Subsidiaries, VIEs and VIE's subsidiary [Line Items] |  |
% of direct or indirect economic ownership | 100.00% |
Guangzhou Huanju Shidai [Member] |  |
Subsidiaries, VIEs and VIE's subsidiary [Line Items] |  |
% of direct or indirect economic ownership | 100.00% |
Engage Capital Partners I LP [Member] |  |
Subsidiaries, VIEs and VIE's subsidiary [Line Items] |  |
% of direct or indirect economic ownership | 93.50% |
[1] | *100 Online Education Technology (Beijing) Co.,Ltd. (“100 Online”), formerly known as Zhengrenqiang and His Partners Education Technology (Beijing) Co., Ltd. (“Zhengrenqiang”).

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=52262685&loc=SL6759159-111685 + Details
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