Quarterly report pursuant to Section 13 or 15(d)

Organization (Details)

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Organization (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Organization [Abstract]        
Accumulated deficit $ 81,561   $ 71,801  
Cash 16,251 $ 10,965 $ 25,190 $ 805
Cash used in operations 8,462 $ 8,605    
Average monthly net use of cash $ 1,500