Commitments and Contingencies - Schedule of Future Minimum Lease Payments under Operating Leases and Financing Obligations, Net of Sublease Income (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Financing Obligation-Leased Facility
Remainder of 2018	$ 2,571
2019	10,621
2020	10,956
2021	11,291
2022	11,649
2023	12,008
Thereafter	65,949
Total	125,045
Operating Leases
Remainder of 2018	690
2019	2,794
2020	2,334
2021	928
2022	667
2023	743
Thereafter	2,974
Total	11,130
Sublease Income
Remainder of 2018	(1,164)
2019	(4,742)
2020	(2,920)
2021	(2,535)
2022	(336)
2023	0
Thereafter	0
Total	(11,697)
Minimum Lease Payments, net
Remainder of 2018	2,097
2019	8,673
2020	10,370
2021	9,684
2022	11,980
2023	12,751
Thereafter	68,923
Total	$ 124,478