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Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities        
Net loss $ (873,317) $ (713,622) $ (4,101,303) $ (4,242,860)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation 13,940 11,420    
Stock-based compensation 8,550 5,626 28,800 155,400
Other non-cash income and expenses (553)    
Investment loss     549
Loss on investment in equity securities 66,205 38,567 2,549,451
Deferred tax (48,028) (96,132)
Changes in assets and liabilities:        
Decrease (increase) in accounts receivable (116,334) 2,835    
Decrease (increase) in prepaid expenses and deposits 29,237 (5,642) (136)
Decrease (increase) in other receivable 39,005    
Decrease (increase) in due from related parties 1,252 19,594 (40,000)
Decrease (increase) in inventory 797 584    
Increase (decrease) in accounts payable (37,353)    
Increase (decrease) in accrued expenses and other current liabilities 305,214 137,288 491,989 132,827
Increase (decrease) in due to related parties 11,857 73,972 440,455 2,469,320
Net cash used in operating activities (599,528) (525,510) (630,195) (1,485,313)
Cash flows from investing activities        
Long-term equity investment (17,801)    
Net cash used in investing activities (17,801)    
Cash flows from financing activities        
Issuance of common stock for acquisition 531,147    
Net proceeds from short-term bank loan 1,000,000    
Net proceeds from short-term borrowing from third-parties 312,824    
Capital contribution from related parties under common control     450,000
Proceeds from convertible notes     800,000
Borrowings from related parties 312,660 50,000 50,000 1,110,000
Repayment of borrowings from related parties (460,000) (13,087) (257,000)
Repayment of bank loans (10,016)    
Net cash provided by financing activities 1,373,791 349,737 593,000 1,560,000
Effect of exchange rate changes on cash and cash equivalents (1,809) (40)
Net increase (decrease) in cash, cash equivalents, and restricted cash equivalents 754,653 (175,813) (37,195) 74,687
Cash, cash equivalents, and restricted cash equivalents        
Beginning 226,688 93,332 93,332 18,645
Ending 981,341 174,444 226,688 93,332
Cash paid during the year for:        
Income tax 1,250 1,850 1,850 830
Interest expense $ 26,592 $ 66,914 127,056 86,000
Non-cash financing and investing activities        
Common shares issued for employees and consultants     80,000
Common shares issued for due to related parties     5,850,000
Capital contribution from related parties under common control     $ 2,550,000