Annual report pursuant to Section 13 and 15(d)

Going Concern (Details Textual)

v3.8.0.1
Going Concern (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Retained Earnings (Accumulated Deficit) $ (194,170) $ (172,034)    
Cash and Cash Equivalents, at Carrying Value, Total $ 17,116 $ 19,055 $ 20,818 $ 17,525