Annual report pursuant to Section 13 and 15(d)

Income Taxes (Schedule of Deferred Tax Assets) (Details)

v3.3.1.900
Income Taxes (Schedule of Deferred Tax Assets) (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Net operating loss carryforwards $ 60,129,827 $ 50,117,798
R&D credit carryforwards 9,465,900 8,394,408
Stock compensation 1,898,394 1,849,847
Intangibles 1,921,934 1,931,193
Temporary differences 801,002 910,354
Deferred tax assets before valuation allowance 74,217,057 63,203,600
Valuation allowance $ (74,217,057) $ (63,203,600)