Commitments and Contingencies - Schedule of Future Minimum Lease Payments under Operating Leases and Financing Obligations, Net of Sublease Income (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Financing Obligation-Leased Facility
2019	$ 10,621
2020	10,956
2021	11,291
2022	11,649
2023	12,008
Thereafter	65,949
Total	122,474
Operating Leases
2019	3,172
2020	2,479
2021	926
2022	635
2023	708
Thereafter	2,832
Total	10,752
Sublease Income
2019	(5,409)
2020	(3,940)
2021	(2,799)
2022	(336)
2023	0
Thereafter	0
Total	(12,484)
Minimum Lease Payments, net
2019	8,384
2020	9,495
2021	9,418
2022	11,948
2023	12,716
Thereafter	68,781
Total	$ 120,742