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Consolidated statements of operations and comprehensive income (loss) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Sep. 30, 2016
Net revenues $ 3,500,516 $ 58,375,399 $ 10,369,444
Cost of revenues (3,974,617) (68,570,871) (12,099,632)
Gross loss (474,101) (10,195,472) (1,730,188)
Operating expenses:      
Research and development expenses (439,005) (1,738,767) (1,879,869)
Sales and marketing expenses (172,972) (3,217,016) (995,290)
General and administrative expenses (1,109,297) (4,328,652) (4,737,843)
Provision for doubtful accounts (44,861) (725,375) (2,779,497)
Impairment charge on property, plant and equipment 0 (972,387) 0
Total operating expenses (1,766,135) (10,982,197) (10,392,499)
Operating loss (2,240,236) (21,177,669) (12,122,687)
Finance income (expenses), net 9,000 (245,015) 0
Other income (expenses), net 36,839 (44,657) 143,073
Loss before income tax (2,194,397) (21,467,341) (11,979,614)
Income tax expense 0 0 (672,580)
Net loss (2,194,397) (21,467,341) (12,652,194)
Other comprehensive income (loss)      
- Foreign currency translation adjustment (563,109) 620,928 (905,494)
Comprehensive loss $ (2,757,506) $ (20,846,413) $ (13,557,688)
Basic and diluted      
- Basic and diluted $ (0.11) $ (0.92) $ (0.71)
Weighted average number of shares of common stock:      
- Basic and diluted 19,745,873 23,237,205 17,786,374