Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

v3.3.1.900
Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]    
Deferred tax assets before valuation allowance $ 74,217,057 $ 63,203,600
R&D credit carryforwards 9,465,900 8,394,408
Net operating loss carryforwards in Israel 7,600,000 7,600,000
Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards 177,587,062 153,100,000
Operating loss carryforwards due to stock-based compensation tax deductions in excess of book compensation expense 15,300,000 15,300,000
R&D credit carryforwards 9,124,032 8,000,000
Net operating loss carryforwards expired 0 0
Net tax credit carryforwards expired 0 0
State Tax Authorities [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards $ 24,700,000 $ 16,900,000
State Tax Authorities [Member] | Begin to expire period [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards expiring date Dec. 31, 2032