Leases - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Leases
Options to extend leases	true
Operating lease cost	$ 1,100	$ 800
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	1,274
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 1,088
Weighted-average remaining lease term - operating leases	3 years 2 months 12 days
Weighted-average discount rate - operating leases	5.80%
Minimum
Leases
Renewal term of the lease	3 years
Maximum
Leases
Renewal term of the lease	5 years