Annual report pursuant to Section 13 and 15(d)

Income Taxes (Schedule of Credit Carryforward Amounts) (Details)

v3.3.1.900
Income Taxes (Schedule of Credit Carryforward Amounts) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]    
U.S. R&D Credit Carryforwards $ 9,465,900 $ 8,394,408
Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards 177,587,062 153,100,000
U.S. R&D Credit Carryforwards $ 9,124,032 $ 8,000,000
1998 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2018  
1998 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 17,142,781  
U.S. R&D Credit Carryforwards $ 1,173,387  
1999 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2019  
1999 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. R&D Credit Carryforwards $ 130,359  
2000 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2020  
2000 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. R&D Credit Carryforwards $ 71,713  
2001 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2021  
2001 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. R&D Credit Carryforwards $ 39,128  
2002 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2022  
2002 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 1,282,447  
U.S. R&D Credit Carryforwards $ 5,350  
2003 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2023  
2003 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 337,714  
U.S. R&D Credit Carryforwards $ 2,905  
2004 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2024  
2004 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 1,237,146  
U.S. R&D Credit Carryforwards $ 22,861  
2005 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2025  
2005 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 2,999,083  
U.S. R&D Credit Carryforwards $ 218,332  
2006 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2026  
2006 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 3,049,735  
U.S. R&D Credit Carryforwards $ 365,541  
2007 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2027  
2007 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 2,842,078  
U.S. R&D Credit Carryforwards $ 342,898  
2008 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2028  
2008 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 2,777,503  
U.S. R&D Credit Carryforwards $ 531,539  
2009 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2029  
2009 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 13,727,950  
U.S. R&D Credit Carryforwards $ 596,843  
2010 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2030  
2010 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 5,397,680  
U.S. R&D Credit Carryforwards $ 1,094,449  
2011 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2031  
2011 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 1,875,665  
U.S. R&D Credit Carryforwards $ 1,950,744  
2012 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2032  
2012 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 28,406,659  
U.S. R&D Credit Carryforwards $ 468,008  
2013 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2033  
2013 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 37,450,522  
U.S. R&D Credit Carryforwards $ 374,406  
2014 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2034  
2014 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 34,088,874  
U.S. R&D Credit Carryforwards $ 648,252  
2015 [Member]    
Operating Loss Carryforwards [Line Items]    
Expiration dates Dec. 31, 2035  
2015 [Member] | Domestic Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
U.S. Net Operating Loss Carryforwards $ 24,971,225  
U.S. R&D Credit Carryforwards $ 1,087,317