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Income Taxes, Deferred Tax Assets and Deferred Tax Liabilities (Tables)
9 Months Ended
Sep. 30, 2019
Income Tax Disclosure [Abstract]  
Schedule of provision for income taxes expenses
   Three months ended
September 30,
   Nine months ended
September 30,
 
   2018   2019   2018   2019 
PRC income tax:                                          
   Current  $-   $-   $-   $- 
   Deferred   -    -    -    - 
   $-   $-   $-   $- 
Schedule of income tax reconciliation
   Three months ended
September 30,
   Nine months ended
September 30,
 
   2018   2019   2018   2019 
Income (Loss) before income taxes  $7,920,563   $(1,787,068)  $1,907,042   $(6,928,575)
United States federal corporate income tax rate   21%   21%   21%   21%
Income tax (credit) expenses computed at United States statutory corporate income tax rate   1,663,318    (375,285)   400,479    (1,455,001)
Reconciling items:                    
Rate differential for PRC earnings   322,253    (42,412)   106,397    (228,917)
Non-deductible expenses   21,333    69,240    118,383    162,110 
Share based payments   7,172    83,190    39,691    90,885 
Recognition of tax losses previously not recognized   (132,104)   -    (132,104)   - 
Valuation allowance on deferred tax assets   (1,881,972)   265,267    (532,846)   1,430,923 
Income tax expenses  $-   $-   $-   $- 
Schedule of deferred tax assets and liabilities
   December 31,   September 30, 
   2018   2019 
Deferred tax assets        
Trade accounts receivable  $1,031,389   $1,025,827 
Inventories   1,715,161    1,600,189 
Property, plant and equipment   618,416    275,833 
Provision for product warranty   562,654    550,324 
Net operating loss carried forward   26,595,654    28,502,024 
Valuation allowance   (30,523,274)   (31,954,197)
Deferred tax assets, non-current  $-   $- 
           
Deferred tax liabilities, non-current  $-   $- 
Schedule of unrecognized tax benefits excluding interest and penalties ("Gross UTB") is as follows

   Gross UTB   Surcharge   Net UTB 
Balance as of January 1, 2019  $7,129,285   $      -   $7,129,285 
Decrease in unrecognized tax benefits taken in current period   (269,811)   -    (269,811)
Balance as of September 30, 2019  $6,859,474   $-   $6,859,474