Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accrued Expenses
Payroll and related costs	$ 911	$ 631
Clinical trials and drug development	639	1,188
Professional fees	200	190
Other	86	152
Total accrued expenses	$ 1,836	$ 2,161