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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of components of deferred tax assets and liabilities
   2019   2018 
Deferred tax assets:        
Net operating losses carry forward  $31,688,387   $34,531,577 
Share-based compensation   1,421,701    2,950,963 
Research and development/orphan drug credits   10,871,634    8,896,703 
Intangibles   5,942,126    - 
Others   13,172    15,285 
Less: valuation allowance   (49,937,020)   (46,394,528)
           
Deferred tax assets, net  $-   $- 
Schedule of difference between income tax provision and U.S federal statutory rate

   December 31,
2019
   December 31,
2018
 
                 
Federal statutory income taxes  $(4,598,801)   (21.0)%  $(4,967,332)   (21.0)%
State income taxes   1,076,602    4.9%   1,413,678    6.0%
Deferred true-up   1,809,913    8.3%   -    -%
Research and Development/Orphan Drug Tax Credit   (1,974,931)   (9.0)%   (1,986,609)   (8.4)%
Other   144,725    0.6%   40,049    0.2%
Change in valuation allowance   3,542,492    16.2%   5,500,214    23.2%
                     
Provision for income tax  $-    -   $-    -