Commitments and Contingencies - Future Minimum Lease Commitments on Non-Cancelable Operating Leases, Lease Income and Sublease Income (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Gross Payments
2018	$ 3,739
2019	3,182
2020	1,791
2021	1,535
2022	1,549
Thereafter	9,066
Gross Payments	20,862
Scheduled Sublease Payments
2018	54
2019	9
Scheduled Sublease Payments	63
Net Payments
2018	3,685
2019	3,173
2020	1,791
2021	1,535
2022	1,549
Thereafter	9,066
Operating Leases, Future Minimum Payments Due, Total	$ 20,799