Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Prepaid Expense And Other Assets Current [Abstract]
Insurance premiums	$ 261	$ 591
Kits for clinical use	220	161
Professional Fees	406
Other	210	222
Total prepaid expenses and other current assets	$ 1,097	$ 974