Leases (Tables)

9 Months Ended

Sep. 30, 2018

Leases

Schedule of minimum lease payments

	Lexington		Amsterdam		Total
	in thousands
2018 (three months remaining)	$	467	$	490	$	957
2019		1,903		1,958		3,861
2020		1,956		1,958		3,914
2021		2,009		1,958		3,967
2022 and beyond		4,890		19,899		24,789
Total minimum lease payments	$	11,225	$	26,263	$	37,488
Deferred rent related to lease incentives-non current	$	4,237	$	3,919	$	8,156
Deferred rent related to lease incentives-current		777		316		1,093

Summary of aggregate rent expense

	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
	in thousands
Rent expense-Lexington	$	278	$	276	$	834	$	828
Rent expense-Amsterdam		412		555		1,263		2,080
Total rent expense	$	690	$	831	$	2,097	$	2,908