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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2017
Income Tax Disclosure [Abstract]  
Schedule of components of deferred tax assets and liabilities
   2017   2016 
Deferred tax assets:          
Net operating losses carry forward  $30,826,534   $38,874,255 
Share-based compensation   3,731,413    8,081,711 
Research & Development/Orphan Drug Credits   6,324,998    830,085
Others   11,369    16,329 
Less: valuation allowance   (40,894,314)   (47,802,380)
           
Deferred tax assets, net  $-   $- 
Schedule of difference between income tax provision and U.S federal statutory rate
   For the year ended 
   December 31, 2017   December 31, 2016   December 31, 2015 
                               
Federal income taxes at 34%  $(9,044,420)   (34.0)%  $(8,269,386)   (34.0)%  $(7,148,607)   (34.0)%
State income taxes   (1,940,945)   (7.3)%   973,547    4.0%          
Change in Federal statutory rate   17,939,714    67.4%   -    -%   -    -%
Deferred true-up   3,090,815    11.8%   (10,511,380)   (43.3)%   1,104,763    5.2%
Research and Development/Orphan Drug Tax Credit   (3,029,074)   (11.4)%   (141,769)   (0.6)%   -    -%
Unrealized derivative gain/loss   (120,870)   (0.5)%   (956,840)   (3.9)%          
Other   12,845    0.0%   13,632    0.1%   -    -%
Change in valuation allowance   (6,908,065)   (26.0)%   18,892,196    77.7%   6,043,844    28.8%
                               
Provision for income tax  $-    -   $-    -   $-    -