Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property and equipment, net	$ (29,797)	$ (61,511)		$ (36,050)
Accrued expenses and other current liabilities	(20,990)	(10,908)		(8,271)
Lease financing obligations, net of current portion	0	(22,987)		0
Total operating lease costs	8,540	4,900	$ 4,800
Cash payments for operating leases	$ 9,400	9,500	8,500
Weighted average remaining lease term	6 years 10 months 24 days
Weighted average discount rate	5.70%
Sublease income	$ 2,000	$ 2,100	$ 1,900
Adjustments Due to Adoption of New Leasing Standard
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property and equipment, net				25,461
Accrued expenses and other current liabilities				2,637
Lease financing obligations, net of current portion				22,987
Adjustments Due to Adoption of New Leasing Standard | Capitalized facility leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property and equipment, net				28,300
Accrued expenses and other current liabilities				1,800
Lease financing obligations, net of current portion				$ 23,000
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining lease terms	2 months
Lease renewal term	3 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining lease terms	10 years 1 month 6 days
Lease renewal term	5 years