Leases (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) ft²	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) ft² location	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($) ft²
Lessee, Lease, Description [Line Items]
Operating lease liabilities, current portion included in other accrued liabilities | $	$ 6,380		$ 6,380		$ 5,739
Operating lease liabilities, long-term portion | $	21,444		21,444		$ 26,297
Operating lease liabilities | $	$ 27,824		$ 27,824
Weighted average remaining lease term	2 years 6 months 25 days		2 years 6 months 25 days
Weighted average discount rate (as a percent)	10.77%		10.77%
Lease expense | $	$ 1,900	$ 2,000	$ 5,800	$ 5,800
Operating lease payments | $	$ 2,200			$ 6,600
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
Term of lease						48 months
Sublease receivable | $						$ 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