Schedule-II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of year	$ 257	$ 365	$ 333
Additions Charged Against Operations	76	315	87
Uncollectible accounts Written-off		(478)	(55)
Balance at End of Year	$ 333	$ 202	$ 365