Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

v3.3.1.900
Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Open Tax Year 2007  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 7,983 $ 6,371
Federal    
Operating Loss Carryforwards $ 71,901  
Operating Loss Carryforwards, Expiration Date Dec. 31, 2027  
Federal | Employee Stock Option [Member]    
Deferred Tax Assets, Net of Valuation Allowance, Total $ 1,662  
Federal | Research Tax Credit Carryforward [Member]    
Operating Loss Carryforwards 534  
State    
Operating Loss Carryforwards $ 56,894  
Operating Loss Carryforwards, Expiration Date Dec. 31, 2017  
State | Employee Stock Option [Member]    
Deferred Tax Assets, Net of Valuation Allowance, Total $ 767  
State | Research Tax Credit Carryforward [Member]    
Operating Loss Carryforwards $ 260