Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

v3.3.1.900
Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Line Items]      
Tax Credit Research Generated During Period $ 340,000    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 2,700,000 $ 500,000 $ 1,700,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 34.00%    
Stock Option Plan [Member]      
Income Tax Disclosure [Line Items]      
Operating Loss Carryforwards $ 4,200,000    
California Franchise Tax Board [Member]      
Income Tax Disclosure [Line Items]      
Operating Loss Carry Forwards Expiration Year 2035 years    
Operating Loss Carryforwards $ 161,100,000    
Domestic Tax Authority [Member]      
Income Tax Disclosure [Line Items]      
Operating Loss Carry Forwards Expiration Year 2035 years    
Operating Loss Carryforwards $ 241,100,000    
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]      
Income Tax Disclosure [Line Items]      
Operating Loss Carry Forwards Expiration Year 2035 years    
Tax Credit Carryforward, Amount $ 8,400,000    
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]      
Income Tax Disclosure [Line Items]      
Tax Credit Carryforward, Amount $ 8,300,000