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Debt (Tables) | 12 Months Ended
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Dec. 31, 2012
Debt | Debt at December 31, 2012 consisted of the following (in thousands):
|  | December 31, 2012 |
|  | Principal |  |  | Unamortized Discount |  |  | Total |
Comerica—Growth Capital Loan A, due 2015 |  | $ | 4,583 |  |  | $ | (49 | ) |  | $ | 4,534 |
Comerica—Revolving Line of Credit, due 2014 |  |  | 3,190 |  |  |  | 0 |  |  |  | 3,190 |
Total debt |  |  | 7,773 |  |  |  | (49 | ) |  |  | 7,724 |
Less: debt—current |  |  | (4,857 | ) |  |  | 29 |  |  |  | (4,828 | )
Debt—non-current |  | $ | 2,916 |  |  | $ | (20 | ) |  | $ | 2,896 |
Debt at December 31, 2011 consisted of the following (in thousands):
|  | December 31, 2011 |
|  | Principal |  |  | Unamortized Discount |  |  | Total |
Comerica—Growth Capital Loan A, due 2015 |  | $ | 5,000 |  |  | $ | (84 | ) |  | $ | 4,916 |
Comerica—Revolving Line of Credit, due 2014 |  |  | 2,300 |  |  |  | 0 |  |  |  | 2,300 |
Total debt |  |  | 7,300 |  |  |  | (84 | ) |  |  | 7,216 |
Less: debt—current |  |  | (2,554 | ) |  |  | 35 |  |  |  | (2,519 | )
Debt—non-current |  | $ | 4,746 |  |  | $ | (49 | ) |  | $ | 4,697 |
Expected Principal and Interest Payments on Debt | Principal and interest payments on debt at December 31, 2012 are expected to be as follows for each of the following three years (in thousands):
Year ended December 31, |  |  |
2013 |  | $ | 2,063 |
2014(1) |  |  | 5,084 |
2015 |  |  | 1,334 |
(1) | Included outstanding revolving line of credit balance based on the Company’s obligation to repay the outstanding revolving line of credit balance at the end of the revolving line of credit term.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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