Balance Sheet Detail Deferred Service Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Movement in Deferred Revenue [Roll Forward]
Deferred Revenue	$ 5,233	$ 5,499
Gross Billings	3,244	4,093
Deferred Revenue, Revenue Recognized	(4,466)	(4,359)
Deferred Revenue	4,011	5,233
Deferred Service Revenue, Current	3,962	4,182
Deferred Revenue, Noncurrent	$ 49	$ 1,051