Commitments and Contingencies - Summary of Future Minimum Payments (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Facility Leases
2019, excluding the three months ended March 31, 2019	$ 7,932
2020	11,919
2021	11,408
2022	10,635
2023 and thereafter	30,933
Total lease payments	72,827
Other Commitments
2019	31,821
2020	2,412
2021	701
2022	1,138
2023 and thereafter	0
Total minimum lease payments	$ 36,072