Income Taxes Income Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended														12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Total pre-tax loss	$ (4,194)	$ (2,083)		$ (932)		$ (2,450)		$ (2,016)		$ (3,533)		$ (6,993)		$ (1,523)	$ (7,817)	$ (12,936)	$ (25,089)
Domestic
Operating Loss Carryforwards [Line Items]
Total pre-tax loss															(12,000)	(15,800)	(29,900)
Foreign
Operating Loss Carryforwards [Line Items]
Total pre-tax loss															$ 4,200	$ 2,900	$ 4,800

[1] For the Year Ended December 31, 2016 For the Year Ended December 31, 2015 FirstQuarter SecondQuarter ThirdQuarter FourthQuarter FirstQuarter SecondQuarter ThirdQuarter FourthQuarter (In thousands, except per share data)Revenues$55,146 $61,288 $55,397 $40,561 $48,687 $47,049 $44,780 $44,077Gross margin12,784 15,445 14,246 13,613 12,626 12,601 13,007 13,918Loss from operations(2,450) (932) (2,083) (4,194) (6,993) (3,533) (2,016) (1,523)Net loss(2,965) (591) (2,638) (4,057) (7,053) (4,119) (2,066) (1,440)Loss per share: Basic$(0.08) $(0.02) $(0.07) $(0.11) $(0.19) $(0.11) $(0.06) $(0.04)Diluted$(0.08) $(0.02) $(0.07) $(0.11) $(0.19) $(0.11) $(0.06) $(0.04)