Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended														12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2014	Sep. 30, 2014	[1]	Jun. 30, 2014	[1]	Mar. 31, 2014	[1]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	$ 3,680							$ 3,688							$ 3,680	$ 3,688	$ 3,446
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	3,300														3,300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense															100
Uncertain Tax Benefits, Potential Change, Current															400
Deferred Tax Assets, Valuation Allowance	86,752							84,240							86,752	84,240
Deferred Tax Assets, Tax Credit Carryforwards, Research	16,200														16,200
Investment Tax Credit															4,600
Deferred Tax Liabilities, Undistributed Foreign Earnings	1,300														1,300
Undistributed Earnings of Foreign Subsidiaries	3,800														3,800
Indefinite Reinvestment of Undistributed Earnings from Foreign Subsidiaries															10,900
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(1,523)	$ (2,016)		$ (3,533)		$ (6,993)		(4,304)	$ (4,103)		$ (7,429)		$ (9,464)		(12,936)	(25,089)	(34,449)
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	167,100							$ 79,700							167,100	79,700
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	5,700														$ 5,700
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Year															2034
CANADA
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Research	16,000														$ 16,000
Domestic [Member]
Operating Loss Carryforwards [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest															15,800	29,900	47,200
Foreign Countries [Member]
Operating Loss Carryforwards [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest															2,900	$ 4,800	$ 12,800
Interest Expense [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	600														600
Penalty [Domain]
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 300														$ 300

[1] For the Year Ended December 31, 2015 For the Year Ended December 31, 2014 FirstQuarter SecondQuarter ThirdQuarter FourthQuarter FirstQuarter SecondQuarter ThirdQuarter FourthQuarter (In thousands, except per share data)Revenues$48,687 $47,049 $44,780 $44,077 $43,799 $49,964 $50,805 $48,174Gross margin12,626 12,601 13,007 13,918 11,148 12,007 14,697 13,950Loss from operations(6,993) (3,533) (2,016) (1,523) (9,464) (7,429) (4,103) (4,304)Net loss(7,053) (4,119) (2,066) (1,440) (10,434) (8,211) (4,469) (4,467)Loss per share: Basic$(0.19) $(0.11) $(0.06) $(0.04) $(0.35) $(0.23) $(0.12) $(0.12)Diluted$(0.19) $(0.11) $(0.06) $(0.04) $(0.35) $(0.23) $(0.12) $(0.12)