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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
OPERATING ACTIVITIES      
Net (loss) income $ (18,331,208) $ (3,594,261) $ 1,878,786
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:      
Provision for losses on accounts receivable and other current assets 13,521,182 3,628,544 830,266
Provision for obsolete inventories 5,629 115,191 30,403
Depreciation 3,206,568 2,842,787 2,940,387
Amortization of intangible assets and other asset 273,076 58,164 734,150
Amortization of convertible note discount 558,690 46,165
Loss on sale of property and equipment 435,767 4,243
Loss from disposal of inventories 128,983 62,732 189,861
Stock-based payments for consulting services 445,749 86,326 43,788
Stock-based compensation 298,091 494,316 584,629
Gain from write-off of long aged payables (278,099)
Impairment of long-term investments 45,400
Changes in operating assets and liabilities:      
Accounts receivable (3,033,406) 923,873 (5,156,120)
Accounts receivable from related parties (292,230) (5,262,357) (5,137,222)
Inventories 59,002 207,233 (320,267)
Other non-current assets (4,343,311)
Other receivables and prepaid expenses 2,054,954 4,385,133 2,497,105
Advances to suppliers (2,643,860) (598,082) 1,123,765
Amounts due to/from related party (870,859) (118,771)
Other payables and accrued expenses 691,846 663,584 652,149
Advances from customers (126,515) 122,720 38,951
Advances from customers from related parties 10,247 91,233 (939,957)
Accounts payable 1,025,912 (503,267) 3,963,341
Accounts payable from related party 68,845
Income tax payable (71,316) (237,968) (1,201,831)
Net cash (used in) provided by operating activities (1,782,839) (1,682,104) 2,473,802
INVESTING ACTIVITIES      
Proceeds from sale of property and equipment 25,697 133 577
Purchases of property, equipment and software (1,668,363) (1,619,325) (1,797,510)
Disbursement of loan receivable - related party (90,977) (400,608)
Disbursement of loan receivable (2,270,006)
Proceeds from loan receivable 2,171,655  
Net cash (used in) provided by investing activities (1,733,643) 151,855 (4,066,939)
FINANCING ACTIVITIES      
Proceeds from borrowings under short-term loans 6,285,837 7,817,959 6,810,017
Repayment of short-term loans (7,052,014) (7,231,612) (8,178,074)
Proceeds from exercise of consultants' stock options 44,843
Proceeds from issuance of convertible note, net of debt issuance costs 2,687,387 1,000,000
Proceeds from issuance of ordinary shares in connection with private placement net of offering costs 1,151,738 1,500,000
Net cash provided by financing activities 3,072,948 1,586,347 176,786
Effect of exchange rate changes on cash and cash equivalents and restricted cash 20,782 (189,692) (191,197)
NET DECREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (422,752) (133,594) (1,607,548)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING 1,519,666 1,653,260 3,260,808
CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, ENDING 1,096,914 1,519,666 1,653,260
Cash paid during the year      
Income taxes 600
Interest 357,092 445,582 484,403
Reconciliation to amounts on consolidated balance sheets      
Cash and cash equivalents 882,770 1,519,666  
Restricted cash 214,144  
Total cash, cash equivalents, and restricted cash 1,096,914 1,519,666  
Supplemental disclosure of significant non-cash transactions:      
Issuance of 79,834 ordinary shares as a result of cashless exercise of stock options [1] 626,000
Purchase of software [1] 1,600,000 1,500,000
Issuance 40,000 ordinary shares as compensation of a consultant's service [1] 110,000
Issuance an individual investor warrant to purchase 26,667 shares of the Company's ordinary share in connection with the issuance of a convertible promissory note. [1] 1,040,000
Issuance warrant to purchase 25,000 shares of the Company's ordinary shares as compensation of a consultant's service. [1] $ 58,000
Issuance of aggregate restrict and non-restricted ordinary shares warrants [1] 300,000    
Issuance of two individual investors warrants with fair value of $11,580 for each to purchase 26,667 shares of the Company's ordinary share in connection with the issuance of convertible promissory note [1] $ 1,480,000    
[1] On July 30, 2020, the Company implemented a one-for-six reverse stock split of the Company's issued and outstanding ordinary shares. Except shares authorized, all references to number of shares, and to per share information in the consolidated financial statements have been retroactively adjusted.