Selected Balance Sheet Information (Details 2) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accrued Expenses [Line Items]
Accrued manufacturing costs	$ 105	$ 247
Accrued vendor payments	470	176
Accrued milestone payments	0	350
Accrued clinical consulting services	1,040	525
Total	$ 1,615	$ 1,298