Leases - Narrative (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2013 USD ($) ft²	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items]
Area of office space (in square feet) | ft²	97,624
Initial built-to-suit lease term	7 years
Renewal term	3 years
Tenant improvement reimbursement allowance	$ 6,400
Capital lease asset	$ 22,300
Land lease expense			$ 900	$ 900
Interest expense related to build-to-suit lease			3,400	3,500
Operating lease right-of-use assets		$ 22,160
Operating lease liabilities		25,277
Operating lease liabilities		9,115
Operating lease liabilities, noncurrent		16,162
Finance lease right-of-use assets		400
Finance lease liabilities		700
Cash payments for operating lease liabilities		$ 9,100
Weighted-average remaining operating lease term		4 years 6 months
Weighted-average discount rate on operating leases		370.00%
Rent expense from operating leases			3,000	2,100
Sublease income			$ 3,600	$ 3,100
Finance lease liabilities, current		$ 400
Finance lease liabilities, noncurrent		300
Cash payments for finance lease liabilities		$ 290
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms		1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms		10 years
Building
Lessee, Lease, Description [Line Items]
Estimated useful life	30 years