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Leases - Summary of Supplemental Cash Flows Information Related to Leases (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Lessee Lease Description [Line Items]  
Total operating leases $ 4,692
For operating leases 434
Operating Leases, Excluding Seattle Office Lease  
Lessee Lease Description [Line Items]  
Total operating leases 345
Seattle Office Lease, Including Amendment  
Lessee Lease Description [Line Items]  
Total operating leases $ 4,347