Leases - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 5,802,000
Operating lease liabilities	4,871,000
Current portion of operating lease liability	982,000
Operating lease payments	$ 310,000
Operating lease, weighted average remaining lease term (in years)	5 years 2 months 12 days
Operating lease, weighted average discount rate, percent	5.30%
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, lease not yet commenced, operating lease expense	$ 3,000
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, lease not yet commenced, operating lease expense	4,000
Operating Leases Commenced
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	1,000,000
Operating lease liabilities	$ 0
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets		$ 5,046,000
Operating lease liabilities		$ 5,131,000