Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2015

Payables and Accruals [Abstract]

Schedule of summary of major components of accrued expenses balance

	Year Ended December 31,
(in thousands)	2014		2015
Corporate legal fees	$	564	$	927
Audit, tax and filing services		189		78
Board fees		45		136
Sublicense fees		125		103
Other miscellaneous		149		52
	$	1,072	$	1,296