Commitments and Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Aug. 31, 2015
Unrecorded Unconditional Purchase Obligation [Line Items]
Prepaid expenses, long term	$ 1,094	$ 1,094
Medpace Clinical Development Service Agreement [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Service agreement, term	five year
Committed service obligation			$ 7,000
Contractual obligation paid		3,000
Expenses for services rendered	$ 1,060
Current prepaid expenses	846	1,010
Prepaid expenses, long term	$ 1,094	$ 1,094