Management's Plan (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Management's Plan [Line Items]
Accumulated deficit	$ (169,659)	$ (144,779)
Cash and Cash Equivalents, at Carrying Value, Total	$ 4,549	$ 20,818	$ 31,806	$ 17,525