Leases (Tables)

3 Months Ended

Mar. 31, 2018

Leases

Schedule of minimum lease payments

	Lexington		Amsterdam		Total
	in thousands
2018 (nine months remaining)	$	1,396	$	1,559	$	2,955
2019		1,903		2,079		3,982
2020		1,956		2,079		4,035
2021		2,009		2,079		4,088
2022 and beyond		4,890		20,786		25,676
Total minimum lease payments	$	12,154	$	28,582	$	40,736
Deferred rent related to lease incentives-non current	$	4,637	$	4,329	$	8,966
Deferred rent related to lease incentives-current		750		336		1,086

Summary of aggregate rent expense

	Three months ended March 31,
	2018		2017
	in thousands
Rent expense-Lexington	$	278	$	278
Rent expense-Amsterdam		429		748
Total rent expense	$	707	$	1,026