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Leases - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Lessee, Lease, Description [Line Items]        
Sublease, remaining lease term     10 months 24 days  
Sublease income $ 710 $ 300 $ 1,417 $ 300
Lease not yet commenced, undiscounted amount $ 20,200   $ 20,200  
Weighted average remaining lease term 3 years 1 month 6 days   3 years 1 month 6 days  
Operating lease, weighted average discount rate, percent 3.30%   3.30%  
Rent expense   $ 2,700   $ 5,300
Maximum        
Lessee, Lease, Description [Line Items]        
Operating lease, remaining lease term     4 years 6 months  
Lease not yet commenced, term of contract 3 years 3 months 18 days   3 years 3 months 18 days  
Co-location Asset Lease | Maximum        
Lessee, Lease, Description [Line Items]        
Operating lease, remaining lease term     4 years 7 months 6 days