Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Payments Required Under Leases

At December 31, 2017, the Company’s future minimum payments required under these leases are as follows:

			Lease Payments
	Operating		to be Received		Net Operating
	Lease		from Sublease		Lease Payments
	(in thousands)
2018	$	3,579	$	257	$	3,322
2019		3,626		—	$	3,626
2020		3,675		—	$	3,675
2021		3,684		—	$	3,684
2022		3,307		—	$	3,307
Thereafter		12,573		—	$	12,573
Total	$	30,444	$	257	$	30,187