Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Payments under Noncancelable Operating Leases

Future minimum lease payments under noncancelable operating leases as of December 31, 2017 were as follows (in thousands):

2018	$	5,316
2019	5,307
2020	5,418
2021	5,551
2022	5,708
Thereafter	19,327
	$	46,627