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Long-term Debt (Details) (USD $) | 3 Months Ended |  |  |  | 0 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Sep. 09, 2011 | May 31, 2009 | Mar. 31, 2009 | Sep. 09, 2011 Term Loan [Member] | Sep. 09, 2011 Term Loan [Member] Initial Payments [Member] | Sep. 09, 2011 Term Loan [Member] Interim Payments [Member] | Sep. 09, 2011 Term Loan [Member] Final Payment [Member] | Sep. 09, 2011 Amended and Restated Loan and Security Agreement [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Origination date |  |  |  |  | Sep. 09, 2011 |  |  |  |
Original loan amount |  |  |  |  | $ 25,000,000 |  |  |  |
Interest rate (in hundredths) |  |  |  |  | 9.87% |  |  |  |
Number of payments |  |  |  |  |  | 12 | 29 | 1 |
Payment amount | 825,000 |  |  |  |  | 20,833 | 825,000 | 825,000 |
Maturity date |  |  |  |  | Mar. 01, 2015 |  |  |  |
Fees amount associated with loan (in hundredths) |  |  |  |  |  |  |  | 5.00% |
Fees amount associated with loan |  |  |  |  | 300,000 |  |  | 1,250,000 |
Date from which warrants are exercisable |  |  |  |  | Sep. 09, 2011 |  |  |  |
Warrants issued to lenders (in shares) |  |  |  |  | 132,891 |  |  |  |
Warrant exercise price (in dollars per share) |  |  | $ 2.62 | $ 2.59 | $ 3.01 |  |  |  |
Warrant expiration date |  |  |  |  | Sep. 09, 2018 |  |  |  |
Term Loan remaining balance at date of Amendment |  |  |  |  | 15,600,000 |  |  |  |
Prorated final payment fee |  |  |  |  |  |  |  |  | 419,000
Net proceeds of the Term Loan, after payment of lender fees and expenses |  |  |  |  | 8,600,000 |  |  |  |
Percentage of cash flows of modified instrument of original debt instrument (in hundredths) | 10.00% |  |  |  |  |  |  |  |
Unamortized debt discount |  |  |  |  | $ 267,000 |  |  |  | $ 332,000
Effective interest rate (in hundredths) |  | 13.63% |  |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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