Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies (Details Textual)

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Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2016
Sep. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Schedule of Organization and Summary of Significant Accounting Policies [Line Items]                
Fair Value Adjustment of Warrants     $ (110) $ (1,185) $ (106) $ (4,464)    
Cash and Cash Equivalents, at Carrying Value, Total     $ 19,305 $ 11,499 $ 19,305 $ 11,499 $ 7,857 $ 15,470
Stockholders' Equity, Reverse Stock Split   Board effected the Reverse Split of the outstanding shares of our common stock with the result that every five and one-half (5.5) outstanding shares of common stock before the Reverse Split represents one (1) share of common stock after the Reverse Split     1 for 5.5 reverse stock split effected in September 2015.      
Revenue Recognition, Milestone Method, Revenue Recognized $ 15,000