Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

v3.19.1
Income Taxes (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets, Valuation Allowance $ 25,052,000 $ 19,022,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount   $ 6,200,000
Deferred Income Tax Expense (Benefit)   $ 0
research and development credit carryforwards [Member]    
Tax Credit Carryforward, Amount $ 1,900,000  
Tax Credit Carryforward, Expiration Date Dec. 31, 2035  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards $ 63,400,000  
Operating Loss Carry forwards Expiration Period 2035  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards $ 55,200,000  
Operating Loss Carry forwards Expiration Period 2035