Leases (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) ft²	Jun. 30, 2019 USD ($) ft²	Jun. 30, 2020 USD ($) ft² location	Jun. 30, 2019 USD ($) ft²	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease liabilities, current portion included in other accrued liabilities | $	$ 6,160		$ 6,160		$ 5,739
Operating lease liabilities, long-term portion | $	23,115		23,115		$ 26,297
Operating lease liabilities | $	$ 29,275		$ 29,275
Weighted average remaining lease term	2 years 8 months 19 days		2 years 8 months 19 days
Weighted average discount rate (as a percent)	10.77%		10.77%
Lease expense | $	$ 1,900	$ 2,000	$ 3,900	$ 3,800
Operating lease payments | $	$ 2,200			$ 4,400
Corporate Headquarters Lease
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	113,000		113,000
Number of office space locations | location			2
Term of lease	84 months		84 months
Renewal term of lease	5 years		5 years
"First Space" Sublease
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	88,000		88,000
"Second Space" Sublease
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	25,000		25,000
Corporate Headquarters Sublease
Lessee, Lease, Description [Line Items]
Office space (area) | ft²		25,879		25,879
Term of lease		48 months		48 months
Sublease receivable | $		$ 1,900		$ 1,900
Tukwila, WA lease
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	10,000		10,000
Term of lease	62 months		62 months
Renewal term of lease	5 years		5 years
Austin TX, Long-term Lease
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	94,000		94,000
Term of lease	132 months		132 months