Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

v3.6.0.2
Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 10,827 $ 7,983
Federal    
Operating Loss Carryforwards $ 93,749  
Operating Loss Carryforwards, Expiration Date Dec. 31, 2027  
Federal | Employee Stock Option [Member]    
Deferred Tax Assets, Net of Valuation Allowance, Total $ 1,684  
Federal | Research Tax Credit Carryforward [Member]    
Operating Loss Carryforwards 818  
State    
Operating Loss Carryforwards $ 76,263  
Operating Loss Carryforwards, Expiration Date Dec. 31, 2017  
State | Employee Stock Option [Member]    
Deferred Tax Assets, Net of Valuation Allowance, Total $ 657  
Open Tax Year 2007  
State | Research Tax Credit Carryforward [Member]    
Operating Loss Carryforwards $ 524  
Foreign Tax Authority [Member]    
Operating Loss Carryforwards $ 2,012