Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Research	$ 18,100,000								$ 18,100,000
Tax Credit Carryforward, Undepreciated Capital Cost									7,900,000
Investment Tax Credit									5,000,000
Deferred Tax Assets, Valuation Allowance	(50,200,000)				(46,428,000)				(50,200,000)	(46,428,000)
Deferred Tax Liabilities, Undistributed Foreign Earnings	100,000								100,000
Undistributed Earnings of Foreign Subsidiaries	300,000								300,000
Indefinite Reinvestment of Undistributed Earnings from Foreign Subsidiaries									11,900,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	(3,590,000)	(34,324,000)	2,422,000	(4,254,000)	(6,477,000)	(5,493,000)	612,000	(45,000)	(40,884,000)	(12,661,000)	(854,000)
Repatriation of Cash from Foreign Subsidiaries									21,300,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense									0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	300,000								300,000
Uncertain Tax Benefits, Potential Change, Current									100,000
Deferred Tax Assets, Net	16,537,000				17,773,000				16,537,000	17,773,000
Tax liability adjustments									0	(18,000)
Unrecognized Tax Benefits	3,011,000				2,878,000				3,011,000	2,878,000	1,358,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	2,600,000								2,600,000
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	112,100,000				95,300,000				112,100,000	95,300,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	77,600,000				69,600,000				77,600,000	69,600,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	3,300,000								3,300,000
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Dates									2013
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Dates									2032
CANADA
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Research	18,800,000								18,800,000
Dividend from Foreign Subsidiary [Member]
Operating Loss Carryforwards [Line Items]
Repatriation of Cash from Foreign Subsidiaries									19,200,000
Return of Capital from Foreign Subsidiary [Member]
Operating Loss Carryforwards [Line Items]
Repatriation of Cash from Foreign Subsidiaries									2,100,000
Domestic [Member]
Operating Loss Carryforwards [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									55,800,000	23,200,000	12,800,000
Foreign Countries [Member]
Operating Loss Carryforwards [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									14,900,000	10,500,000	11,900,000
Interest Expense [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 400,000								$ 400,000