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Debt (Tables) | 6 Months Ended
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Jun. 30, 2013
Debt | Debt at June 30, 2013, consisted of the following (in thousands):
|  | June 30, 2013 |
|  | Principal |  |  | Unamortized Discount |  |  | Total |
Comerica - Revolving Line of Credit, due 2014 |  | $ | 2,157 |  |  |  | 0 |  |  | $ | 2,157 |
Total debt |  |  | 2,157 |  |  |  | 0 |  |  |  | 2,157 |
Less: debt - current |  |  | (2,157 | ) |  |  | 0 |  |  |  | (2,157 | )
Debt - non-current |  | $ | 0 |  |  |  | 0 |  |  | $ | 0 |
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 |
Expected Principal and Interest Payments on Debt | Principal and interest payments on debt at June 30, 2013, are expected to be as follows for each of the following five years (in thousands):
Year ended December 31, |  |  |
2013 (remaining six months) |  | $ | 52 |
2014(1) |  |  | 2,217 |
2015 |  |  | 0 |
2016 |  |  | 0 |
2017 |  |  | 0 |
(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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