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Debt - Equipment Financing Narrative (Details) (GE Capital Corporation [Member], Notes Payable, Other Payables [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Mar. 31, 2007	Mar. 31, 2007 General Electric Promissory Note One [Member]	Dec. 31, 2007 General Electric Promissory Note Two [Member]
Debt Instrument [Line Items]
Debt instrument, outstanding		$ 10,000,000
Debt instrument, outstanding			$ 3,500,000	$ 1,000,000
Repayment period	48 months
Interest rate			10.08%	9.91%

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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