Leases (Details) $ in Thousands		3 Months Ended
	Jan. 01, 2019 USD ($)	Mar. 31, 2020 USD ($) item	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Leases
Minimum number of renewal option | item		1
Lessee, Operating Lease, Existence of Option to Extend [true false]		true
Lessee, Finance Lease, Existence of Option to Extend [true false]		false
Lessee, Operating Lease, Existence of Option to Terminate [true false]		true
Lessee, Finance Lease, Existence of Option to Terminate [true false]		false
Finance lease - Right-of-use asset		$ 12,280		$ 12,280
Finance lease - Right-of-use asset, accumulated depreciation and amortization		5,910		$ 5,387
Lease cost
Operating lease expense		859	$ 885
Finance lease expense:
Depreciation and amortization of assets included in property and equipment, net		538	524
Interest on lease liabilities		0	56
Total finance lease expense		538	580
Interest on lease liabilities capitalized		24	0
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases		(1,056)	(977)
Operating cash flows from finance leases		(24)	(56)
Financing cash flows from finance leases		$ (818)	(1,176)
Right-of-use assets obtained in exchange for lease obligations, net of terminations:
Operating leases, right-of-use assets	$ 16,916		$ 16,916
Operating leases, weighted average remaining lease term (in years)		5 years 10 months 24 days
Finance leases, weighted average remaining lease term (in years)		1 year
Operating leases, weighted average discount rate (as a percent)		5.30%
Finance leases, weighted average discount rate (as a percent)		3.20%
Minimum
Leases
Operating leases, remaining term of contract		1 year
Finance leases, remaining term of contract		1 month
Operating leases, renewal term		1 year
Maximum
Leases
Operating leases, remaining term of contract		9 years
Finance leases, remaining term of contract		15 months
Operating leases, renewal term		10 years