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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Commitments and Contingencies        
Rent expense $ 1,600 $ 1,600 $ 4,700 $ 4,100
Non-cancelable commitments under operating leases        
2017 (remainder of year) 1,310   1,310  
2018 5,961   5,961  
2019 6,748   6,748  
2020 7,077   7,077  
2021 4,823   4,823  
2022 and thereafter 5,117   5,117  
Total minimum payments $ 31,036   $ 31,036