Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies (Details Textual)

v3.8.0.1
Significant Accounting Policies (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Mar. 17, 2015
Equity Method Investment, Annual Equity Fee, Percentage     2.50%
Research and Development Expense [Member]      
Stock Issued During Period, Value, Issued for Services $ 2.3 $ 3.9