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Discontinued operations (Schedule of Discontinued Operations) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Results of the discontinued operation |  |  |
Revenues, net of rebates and discounts | $ 11,428,000 | $ 15,981,000 | $ 25,160,000
Income tax expenses | (1,131,000) | (1,168,000) | (4,907,000)
Assets |  |  |
Total assets held for sale | 26,000 | 20,000 |
Current liabilities |  |  |
Total liabilities held for sale | 822,000 | 1,338,000 |
Xunlei Kankan [Member] |  |  |
Results of the discontinued operation |  |  |
Revenues, net of rebates and discounts | 0 | 0 | 15,677,000
Business taxes and surcharges | 0 | 0 | (447,000)
Net revenues | 0 | 0 | 15,230,000
Cost of revenues | 0 | 0 | (13,240,000)
Gross profit | 0 | 0 | 1,990,000
Research and development expenses | 0 | 5,000 | (3,245,000)
Sales and marketing expenses | 0 | (27,000) | (7,384,000)
General and administrative expenses | 0 | (221,000) | (3,051,000)
Total operating expenses | 0 | (243,000) | (13,680,000)
Net gain from exchanges of content copyrights | 0 | 0 | 137,000
Operating loss | 0 | (243,000) | (11,553,000)
Gain on disposal of Kankan | 0 | 0 | 1,505,000
Income tax expenses | 0 | 36,000 | (2,048,000)
Loss from discontinued operations | 0 | (207,000) | (12,096,000)
Cash flows generated from/ (used in) discontinued operations |  |  |
Net cash used in operating activities | 0 | (215,000) | (1,554,000)
Net cash generated from investing activities |  | 0 | 9,135,000
Net cash used in financing activities |  |  |
Net cash flow for the year | 0 | (215,000) | 7,581,000
Web Game Business [Member] |  |  |
Results of the discontinued operation |  |  |
Revenues, net of rebates and discounts | 11,428,000 | 15,981,000 | 25,160,000
Business taxes and surcharges | (27,000) | (25,000) | (45,000)
Net revenues | 11,401,000 | 15,956,000 | 25,115,000
Cost of revenues | (522,000) | (391,000) | (785,000)
Gross profit | 10,879,000 | 15,565,000 | 24,330,000
Research and development expenses | (2,217,000) | (3,192,000) | (2,488,000)
Sales and marketing expenses | (1,025,000) | (4,180,000) | (2,631,000)
General and administrative expenses | (99,000) | (159,000) | (155,000)
Total operating expenses | (3,341,000) | (7,531,000) | (5,274,000)
Operating loss | 7,538,000 | 8,034,000 | 19,056,000
Income tax expenses | (1,131,000) | (1,204,000) | (2,859,000)
Loss from discontinued operations | 6,407,000 | 6,830,000 | 16,197,000
Assets |  |  |
Property and equipment, net | 26,000 | 20,000 |
Total assets held for sale | 26,000 | 20,000 |
Current liabilities |  |  |
Deferred revenue, current portion | 822,000 | 1,338,000 |
Total liabilities held for sale | 822,000 | 1,338,000 |
Cash flows generated from/ (used in) discontinued operations |  |  |
Net cash used in operating activities | 5,585,000 | 5,492,000 | 15,286,000
Net cash generated from investing activities | (13,000) | (12,000) | (1,000)
Net cash used in financing activities | 0 | 0 | 0
Net cash flow for the year | $ 5,572,000 | $ 5,480,000 | $ 15,285,000

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