Income Taxes - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Taxes, Miscellaneous [Abstract]
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 200,000		$ 500,000
Operating Loss Carryforwards	2,600,000		17,100,000
Operating Loss Carryforward, Windfall Tax Benefit	700,000		3,000,000
Unrecognized Tax Benefits	1,223,000	[1]	1,126,000	891,000	668,000
Research Tax Credit Carryforward [Member]
Taxes, Miscellaneous [Abstract]
Tax Credit Carryforward, Amount	2,000,000		1,700,000
Tax Credit Carryforward Amount, Windfall Tax Benefit	200,000		0
Alternative Minimum Tax [Member]
Taxes, Miscellaneous [Abstract]
Tax Credit Carryforward, Amount	$ 700,000

[1] Represents uncertain tax positions for which we could not make a reasonable estimate of the amount or the exact period of related future payments. Refer to Note 9. Income Taxes.