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
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Schedule of Organization and Summary of Significant Accounting Policies [Line Items]        
Fair Value Adjustment of Warrants $ 4 $ (3,279)    
Cash and Cash Equivalents, at Carrying Value, Total $ 5,762 $ 13,423 $ 7,857 $ 15,470
Stockholders' Equity, Reverse Stock Split 1 for 5.5 reverse stock split effected in September 2015.      
Revenue Recognition, Milestone Method, Revenue Recognized $ 15,000