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Condensed Consolidated statements of cash flows - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Cash flows from operating activities          
Net (loss) profit $ 7,920,563 $ (4,202,753) $ 1,907,042 $ (10,024,349)  
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:          
Depreciation and amortization     1,767,584 1,006,122  
Provision for doubtful debts     176,961 361,217 $ 725,375
Write-down of inventories 729,247 360,778 730,446 1,359,182  
Share-based compensation     189,002 635,530  
Gain on disposal of property, plant and equipment     (1,137) 0  
Gain on disposal of patented proprietary technology     (12,296,776) 0  
Exchange gain     0 (93,488)  
Changes in operating assets and liabilities:          
Trade accounts and bills receivable     27,035,867 (27,736,858)  
Inventories     (530,345) (1,757,900)  
Prepayments and other receivables     394,178 (583,517)  
Trade accounts and bills payable     (1,226,192) 18,315,114  
Accrued expenses and other payables     (368,702) 1,438,167  
Income taxes payable     0 (615,031)  
Trade receivable from and payables to former subsidiaries     (8,637,203) 11,163,618  
Net cash (used in) provided by operating activities     9,140,725 (6,532,193)  
Cash flows from investing activities          
Proceeds on disposal of property, plant and equipment     13,319 0  
Purchases of property, plant and equipment and construction in progress     (6,574,347) (8,738,549)  
Net cash used in investing activities     (6,561,028) (8,738,549)  
Cash flows from financing activities          
Advances from investors     0 2,056,706  
Advances from former subsidiary     0 2,056,706  
Capital injection from non-controlling interests     26,864 0  
Proceeds from bank borrowings     24,233,796 0  
Repayment of bank borrowings     (19,411,531) (1,469,076)  
Borrowings from unrelated parties     76,544 5,530,190  
Repayment of borrowings from unrelated parties     (44,091) (5,874,816)  
Borrowings from related parties     10,696,243 2,083,150  
Repayment of borrowings from related parties     (8,206,464) (1,522,697)  
Proceeds from issuance of common stock     0 9,605,277  
Net cash provided by financing activities     7,371,361 12,465,440  
Effect of exchange rate changes on cash and cash equivalents and restricted cash     (1,052,946) 204,086  
Net (decrease) increase in cash and cash equivalents and restricted cash     8,898,112 (2,601,216)  
Cash and cash equivalents and restricted cash at the beginning of period     10,748,713 4,686,857 4,686,857
Cash and cash equivalents and restricted cash at the end of period $ 19,646,825 $ 2,085,641 19,646,825 2,085,641 $ 10,748,713
Supplemental non-cash investing and financing activities:          
Transfer of construction in progress to property, plant and equipment     7,236,709 14,990,191  
Proceeds on disposal of patented proprietary technology offset against amount due to a former subsidiary     13,034,583 0  
Cash paid during the period for:          
Income taxes     0 615,031  
Interest, net of amounts capitalized     $ 721,029 $ 0