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Related Parties (Details) - Medpace Clinical Development Service Agreement [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Related Party Transaction [Line Items]
Clinical development service fees to related parties	$ 512	$ 0	$ 567	$ 0
Due to related parties	$ 512		$ 512		$ 0
Dr. August J. Troendle, Officer and Director [Member] \| Minimum [Member]
Related Party Transaction [Line Items]
Percentage of ownership	5.00%		5.00%