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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities      
Net loss $ (4,450,994) $ (8,910,002) $ (5,136,434)
Adjustments to reconcile net loss to net cash used in operating activities:      
Stock-based compensation to employees 69,176 247,134 479,233
Stock-based compensation to non-employees 179,112 944,887  
Depreciation and amortization 778,117 827,630 1,328,403
Loss from disposal of inventories 6,218 58,992
Change in fair value of warrants liability (739,616) (599,865) 229,749
Loss on disposal of equipment and intangible assets 18,502 232,171
(Recovery from) provision for doubtful accounts:      
- accounts receivable 10,148 5,826 (46,831)
- other receivables and prepayments 499 16,403 32,213
Change in warranty obligation (7,911) (10,261) (130,885)
(Recovery from) provision for inventory obsolescence 2,363 (73,860)
Impairment loss for intangible assets 3,281,779
Unrealized loss on marketable securities 1,356,565
Changes in assets and liabilities:      
Decrease (increase) in accounts receivable 20,222 (88,270) 115,239
Decrease (increase) in advances to suppliers      
- third parties 145,024 233,490 (341,776)
- related party 194,311
Decrease(increase) in other receivables and prepayments 69,773 23,352 (71,117)
Increase in interest receivable - related party (2,523) (161,384)
Decrease(increase) in inventories 255,592 (137,464) (2,007,026)
Decrease(increase) in other taxes receivable 36,858 (92,897) (281,373)
Decrease(increase) in accounts payable (8,234) 186,561 (24,563)
Increase in interest payable- related party 2,053 178,708
Decrease in due to related parties - Trade (475)
Increase (decrease) in advances from customers 34,799 (80,602) 206,646
Increase (decrease) in accrued expenses and other current liabilities 553,354 214,245 119,549
Net cash used in operating activities (1,670,903) (3,629,567) (5,408,997)
Cash flows from investing activities      
Proceeds from disposal of equipment 23,016 1,309
Capital expenditures and other additions (776,328) (40,780)
Loan to a related party (6,000,000) (3,000,000)
Repayment from a related party 549,192 3,000,000
Consideration paid to BTL (146,032)
Non-marketable equity investments (1,500,043)
Net cash provided by(used in) investing activities 23,016 (6,225,827) (1,686,855)
Cash flows from financing activities      
Loans from related parties 1,362,681 3,682,642 1,480,320
Net proceeds from option exercises 17,851
Net proceeds from issuance of common stock, net of issuance costs 1,492,538
Net cash provided by financing activities 1,362,681 3,700,493 2,972,858
Effect of exchange rate fluctuations on cash and cash equivalents (169,269) (177,275) 139,656
Net decrease in cash and cash equivalents (454,475) (6,332,176) (3,983,338)
Cash and cash equivalents at beginning of year 477,309 6,809,485 10,792,823
Cash and cash equivalents at end of year 22,834 477,309 6,809,485
Cash paid during the year for:      
Income tax
Interest 14,840 3,812
Non-cash investing and financing activities:      
Acquisition of property and equipment and construction in progress by decreasing inventories 947,172
Offset short-term borrowings - related party against loans to a related party (including accrued interests) $ 5,381,589