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Condensed consolidated statements of operations and comprehensive income (loss) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net revenues $ 3,312,797 $ 3,716,144
Cost of revenues (3,659,943) (4,133,321)
Gross loss (347,146) (417,177)
Operating expenses:    
Research and development expenses (817,090) (430,344)
Sales and marketing expenses (204,586) (234,880)
General and administrative expenses (1,131,294) (975,371)
(Provision for) Recovery of doubtful accounts 86,653 (9,105)
Total operating expenses (2,066,317) (1,649,700)
Operating loss (2,413,463) (2,066,877)
Finance expenses, net (170,089) (2,728)
Other income, net 15,719 1,389
Loss before income tax (2,567,833) (2,068,216)
Income tax expense 0 0
Net loss (2,567,833) (2,068,216)
Other comprehensive income (loss)    
- Foreign currency translation adjustment 135,708 (19,646)
Comprehensive loss $ (2,432,125) $ (2,087,862)
Loss per share    
- Basic and diluted $ (0.10) $ (0.10)
Weighted average number of shares of common stock:    
- Basic and diluted 26,502,086 19,856,778