Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) ft² item	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease liabilities, current portion included in other accrued liabilities | $	$ 6,049		$ 7,300
Operating lease liabilities, long-term portion | $	50,811		$ 21,246
Operating lease liabilities | $	56,860
Noncash investing activities related to right-of-use assets | $	$ 29,700
Weighted average discount rate (as a percent)	7.51%
Lease expense | $	$ 2,700	$ 1,900
Operating lease payments | $	$ 2,500	$ 2,200
Corporate Headquarters Lease
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	113,000
Number of office space locations | item	2
Term of lease	84 months
Renewal term of lease	5 years
"First Space" Sublease
Lessee, Lease, Description [Line Items]
Number of office space locations | ft²	88,000
"Second Space" Sublease
Lessee, Lease, Description [Line Items]
Number of office space locations | ft²	25,000
Corporate Headquarters Lease Amendment
Lessee, Lease, Description [Line Items]
Annual lease payment | $	$ 9,300
Term of lease	48 months
Austin TX, Long-term Lease
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	94,000
Term of lease	132 months
Tukwila, WA Lease
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	10,000
Term of lease	62 months
Renewal term of lease	5 years
San Carlos, CA Sublease
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	25,879
Term of lease	48 months
Sublease receivable | $	$ 1,900
San Carlos, CA Sublease Amendment
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	22,405
San Carlos, CA Sublease Amendment | Rentable square feet returned in lease amendment
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	3,474
South San Francisco, CA Lease
Lessee, Lease, Description [Line Items]
Office space (area) | ft²	11,395
Annual lease payment | $	$ 900
Term of lease	36 months