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Discontinued operations - Results of discontinued operations (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Results of the discontinued operation      
Revenues, net of rebates and discounts $ 0 $ 656,000 $ 11,428,000
Operating Expenses $ 137,174,000 159,266,000 136,908,000
Income tax expenses   (230,000) (1,131,000)
Web Game Business [Member]      
Results of the discontinued operation      
Revenues, net of rebates and discounts   656,000 11,428,000
Business taxes and surcharges   (1,000) (27,000)
Net revenues   655,000 11,401,000
Cost of revenues   (16,000) (522,000)
Gross profit   639,000 10,879,000
Research and development expenses   (419,000) (2,217,000)
Sales and marketing expenses   (63,000) (1,025,000)
General and administrative expenses   (18,000) (99,000)
Total operating expenses   (500,000) (3,341,000)
Operating income   139,000 7,538,000
Gain on disposal of web game   1,394,000  
Income tax expenses   (230,000) (1,131,000)
Income from discontinued operations   1,303,000 6,407,000
Cash flows generated from the discontinued operations      
Net cash used in operating activities   1,065,000 5,585,000
Net cash generated from investing activities   0 (13,000)
Net cash flow for the year   $ 1,065,000 $ 5,572,000