Commitments and Contingencies (Details Textual) $ in Thousands		6 Months Ended
	Mar. 02, 2016	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Aug. 01, 2013 ft²
Commitments And Contingencies [Line Items]
Area of office facilities taken on lease | ft²				5,300
Additional operating lease term	38 months
Lease renewal start date	Oct. 01, 2016
Lease expiration date	Nov. 30, 2019
Rent expense		$ 41	$ 40
Royalty buy down due period		6 months
Minimum
Commitments And Contingencies [Line Items]
Percentage of royalty obligation		12.50%
Percentage of range of royalties that can be bought down		12.50%
Maximum
Commitments And Contingencies [Line Items]
Percentage of royalty obligation		25.00%
Percentage of range of royalties that can be bought down		17.00%
Clinical Research Agreement with Duke University
Commitments And Contingencies [Line Items]
Agreement termination notice period		90 days
Upon Food and Drug Administration Approval
Commitments And Contingencies [Line Items]
Expected milestone payments due upon approval		$ 8,000
Upon Regulatory Marketing Approval
Commitments And Contingencies [Line Items]
Expected milestone payments due upon approval		$ 5,000
CPEC
Commitments And Contingencies [Line Items]
Percentage of royalty obligation		5.00%