Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Leases [Abstract]
Remaining term of operating leases (in years)	5 years
Total rental expense under operating leases	$ 2,100	$ 2,200	$ 2,800
Minimum future operating lease payments [Abstract]
2017	665
2018	676
2019	688
2020	490
2021 and thereafter	46
Total	$ 2,565