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Condensed Consolidated statements of cash flows - USD ($)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities    
Net loss $ (6,013,521) $ (5,821,596)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 1,122,341 631,781
Provision for doubtful debts (14,690) 380,808
Write-down of inventories 1,199 998,403
Share-based compensation 154,855 491,247
Exchange gain (113,812) (63,014)
Changes in operating assets and liabilities:    
Trade accounts and bills receivable 25,756,828 (7,898,896)
Inventories (1,067,131) (252,756)
Prepayments and other receivables (364,489) (34,144)
Trade accounts and bills payable (8,118,997) 3,093,339
Accrued expenses and other payables (191,226) 969,912
Income taxes payable 0 (608,922)
Trade receivable from and payables to former subsidiaries (6,460,523) 4,629,774
Net cash (used in) provided by operating activities 4,690,834 (3,484,064)
Cash flows from investing activities    
Purchases of property, plant and equipment and construction in progress (7,492,193) (6,808,832)
Net cash used in investing activities (7,492,193) (6,808,832)
Cash flows from financing activities    
Advances from investors 0 2,036,275
Proceeds from bank borrowings 23,450,876 0
Repayment of bank borrowings (19,916,752) 0
Borrowings from unrelated parties 0 4,363,446
Repayment of borrowings to unrelated parties 0 (4,746,539)
Borrowings from related parties 10,619,650 1,873,373
Repayment of borrowings from related parties (8,419,793) (1,047,227)
Proceeds from issuance of common stock 0 9,605,277
Net cash provided by financing activities 5,733,981 12,084,605
Effect of exchange rate changes on cash and cash equivalents, and restricted cash (182,861) 116,793
Net increase in cash and cash equivalents, and restricted cash 2,749,761 1,908,502
Cash and cash equivalents, and restricted cash at the beginning of period 10,748,713 4,686,857
Cash and cash equivalents, and restricted cash at the end of period 13,498,474 6,595,359
Non-cash transactions:    
Transfer of construction in progress to property, plant and equipment 4,412,939 1,880,081
Cash paid during the period for:    
Income taxes 0 608,922
Interest, net of amounts capitalized $ 354,603 $ 0