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, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Total pre-tax loss	$ (17,027)	$ (13,926)		$ (6,695)		$ (9,135)		$ (2,083)		$ (932)		$ (2,450)		$ (4,194)	$ (48,877)	$ (7,817)	$ (12,936)
Domestic
Operating Loss Carryforwards [Line Items]
Total pre-tax loss															(54,000)	(12,000)	(15,800)
Foreign
Operating Loss Carryforwards [Line Items]
Total pre-tax loss															$ 5,100	$ 4,200	$ 2,900

[1] For the Year Ended December 31, 2017 For the Year Ended December 31, 2016 FirstQuarter SecondQuarter ThirdQuarter FourthQuarter FirstQuarter SecondQuarter ThirdQuarter FourthQuarter (In thousands, except per share data)Revenues$37,610 $35,093 $28,773 $32,292 $55,146 $61,288 $55,397 $40,561Gross margin8,222 10,008 1,195 1,345 12,784 15,445 14,246 13,613Loss from operations(9,135) (6,695) (13,926) (17,027) (2,450) (932) (2,083) (4,194)Net loss(10,008) (7,554) (15,411) (19,631) (2,965) (591) (2,638) (4,057)Loss per share: Basic$(0.26) $(0.19) $(0.39) $(0.50) $(0.08) $(0.02) $(0.07) $(0.11)Diluted$(0.26) $(0.19) $(0.39) $(0.50) $(0.08) $(0.02) $(0.07) $(0.11)