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Debt - Outstanding Long-Term Debt (Details) - USD ($) | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
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Debt Instrument [Line Items] |  |  |
Total debt, outstanding principal | $ 24,298,000 | $ 24,500,000 |
Less: current portion, outstanding principal | (20,798,000) | (20,000,000) |
Long-term debt, outstanding principal | 3,500,000 | 4,500,000 |
Total debt, unamortized discount | (1,753,000) | (2,369,000) |
Less: current portion, unamortized discount | 1,032,000 | 930,000 |
Long-term debt, unamortized discount | (721,000) | (1,439,000) |
Total debt, net carrying amount | 22,545,000 | 22,131,000 |
Less: current portion, net carrying amount | (19,766,000) | (19,070,000) |
Long-term debt | 2,779,000 | 3,061,000 |
Hercules Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Total debt, outstanding principal | 20,000,000 | 20,000,000 | $ 20,000,000
Total debt, unamortized discount | (752,000) | (930,000) |
Total debt, net carrying amount | 19,248,000 | 19,070,000 |
Convertible Note |  |  |
Debt Instrument [Line Items] |  |  |
Total debt, outstanding principal | 4,298,000 | 4,500,000 |
Total debt, unamortized discount | (1,001,000) | (1,439,000) |
Total debt, net carrying amount | $ 3,297,000 | $ 3,061,000 |

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