Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Remaining term of operating leases (in years)	4 years
Minimum future operating lease payments [Abstract]
2019	$ 1,406
2020	1,069
2021	371
2022	161
2023 and thereafter	0
Total	3,007
Total rental expense under operating leases	$ 1,900	$ 2,000	$ 2,100