Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

v3.19.1
Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets, Valuation Allowance $ 13,339 $ 5,742
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00%
Research and Development Expense $ 17,696 $ 6,698
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 2,500
Domestic Tax Authority [Member]    
Operating Loss Carryforwards $ 34,500  
Operating Loss Carry forward, Expire Period 2035 years  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards $ 43,100  
Operating Loss Carry forward, Expire Period 2035 years