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Long-term investments - Additional Information (Details) - USD ($) | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2019 | Dec. 31, 2019 | Jul. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cost Method Investments. |  | $ 26,365,000 |  | $ 33,638,000 | $ 42,430,000
Shanghai Lexiang [Member] |  |  |  |  |
Cost Method Investments |  | 14,518,000 |  |  |
Equity method investment |  | 1,176,000 |  |  |
Cloudtropy [Member] |  |  |  |  |
Cost Method Investments |  | 4,213,000 |  |  |
Beijing Cloudin Technology [Member] |  |  |  |  |
Cost Method Investments |  | 1,100,000 |  |  |
Shen Zhen Arashi [Member] |  |  |  |  |
Equity method investment |  | $ 12,083,000 |  |  |
Gain on disposal of equity interest | $ 579,000 |  |  |  |
Percent of equity interest owned | 1.25% |  |  |  |
Shenzhen Xunlei [Member] |  |  |  |  |
Equity method investment |  |  | $ 2,838,000 |  |
Chengdu Diting [Member] |  |  |  |  |
Percent of equity interest owned |  | 12.74% |  | 12.74% |
Guangzhou Yuechuan [Member] |  |  |  |  |
Percent of equity interest owned |  | 9.30% |  | 9.30% |
Zhuhai Qianyou [Member] |  |  |  |  |
Percent of equity interest owned |  | 19.00% |  | 19.00% |

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