Accrued Expenses

3 Months Ended

Mar. 31, 2017

Payables And Accruals [Abstract]

Accrued Expenses

4. Accrued Expenses

Accrued expenses consist of the following:

	March 31, 2017		December 31, 2016
	(in thousands)
Development costs	$	18,792	$	14,541
Employee-related expenses		2,145		5,948
Professional services		2,715		1,751
Other accrued expenses		—		112
	$	23,652	$	22,352