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Commitments and Contingencies - Summary of Future Minimum Payments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Facility Leases    
2017 $ 1,793 $ 4,803
2018 7,592 6,227
2019 8,102 6,652
2020 7,183 5,563
2021 and thereafter 35,193 32,262
Total minimum lease payments 59,863 55,507
Other Commitments    
2017 2,504 2,123
2018 642 848
2019 0 0
2020 0 0
2021 and thereafter 0 0
Total minimum lease payments $ 3,146 $ 2,971