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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net loss $ (5,136,434) $ (9,860,888) $ (10,362,335)
Net loss from discontinued operations (251,153) (3,663,465)
Net loss from continuing operations (5,136,434) (9,609,735) (6,698,870)
Adjustments to reconcile net loss to net cash used in operating activities:      
Stock-based compensation 479,233 947,481 1,055,744
Depreciation and amortization 1,328,403 1,232,263 525,916
Loss from disposal of inventories 202,297
Loss from warrant redemption 1,091,719
Change in fair value of warrants liability 229,749 (527,617) (390,324)
Loss on disposal of equipment and intangible assets 18,241
(Recovery from) provision for doubtful accounts: accounts receivable (46,831) (139,716) 10,014
(Recovery from) provision for doubtful accounts: other receivables and prepayments 32,213 (41,790) (1,899)
(Recovery from) provision for doubtful accounts: advances to suppliers - third parties (1,095) 429
Change in warranty obligation (130,885) 141,449 (120,105)
(Recovery from) provision for inventory obsolescence (73,860) 2,450,213 16,203
Changes in assets and liabilities:      
Decrease in accounts receivable 115,239 115,854 32,700
(Increase) decrease in advances to suppliers - third parties (341,776) 547,267 1,011,843
(Increase) decrease in advances to suppliers - related party 194,311 680,733 623,583
(Increase) decrease in other receivables and prepayments (71,117) 13,272 1,588,626
(Increase) decrease in inventories (2,007,026) 1,185,688 41,816
Increase in other taxes receivable (281,373)
Decrease (increase) in long-term prepaid expenses 290,036 (148,386)
(Decrease) increase in accounts payable (24,563) 51,579 (24,913)
(Decrease) increase in due to related parties - Trade (475) 107,715 (40,335)
Increase (decrease) in advances from customers 206,646 63,541 (18,463)
Increase (decrease) in accrued expenses and other current liabilities 119,549 (1,315,779) 1,336,906
Decrease in other taxes payable (113,429) (12,178)
Net cash used in operating activities from continuing operations (5,408,997) (2,609,813) (1,211,693)
Net cash used in operating activities from discontinued operations (165,345) (1,133,122)
Net cash used in operating activities (5,408,997) (2,775,158) (2,344,815)
Cash flows from investing activities      
Capital expenditures and other additions (40,780) (636,130) (27,477)
Loan to a related party (3,000,000) (2,000,000)
Repayment from a related party 3,000,000 2,000,000
Considerations paid to BTL (146,032)
Available-for-sale investments (1,500,043)
Net cash used in investing activities from continuing operations (1,686,855) (636,130) (27,477)
Net cash used in investing activities from discontinued operations (384)
Net cash used in investing activities (1,686,855) (636,130) (27,861)
Cash flows from financing activities      
Loans from related parties 1,480,320 733,688 3,867,859
Repayments of related party loans (2,858,748) (1,603,590)
Proceeds from bank loans 4,008,975
Repayments of bank loans (1,505,000) (4,810,770)
Net proceeds from option exercises 10,150 36,250
Payment of warrant redemption (1,116,744)
Net proceeds from issuance of common stock, net of issuance costs 1,492,538 18,412,462
Net cash provided by financing activities from continuing operations 2,972,858 13,675,808 1,498,724
Net cash provided by financing activities from discontinued operations
Net cash provided by financing activities 2,972,858 13,675,808 1,498,724
Effect of exchange rate fluctuations on cash and cash equivalents 139,656 (96,421) (229,087)
Net (decrease) increase in cash and cash equivalents (3,983,338) 10,168,099 (1,103,039)
Cash and cash equivalents at beginning of year 10,792,823 624,724 1,727,763
Cash and cash equivalents at end of year 6,809,485 10,792,823 624,724
-less cash and cash equivalents at end of year from discontinued operations (9,207)
Cash and cash equivalents at end of year from continuing operations 6,809,485 10,792,823 624,724
Supplemental cash flow information      
Income tax paid
Interest paid $ 3,812 $ 128,537 $ 196,220