Our debt activity at December 31, 2017 is summarized below (in thousands): | Current Debt | | Current | | Long-term | | Total | | | Balance at Jan. 1, 2017 | | $ | 2,521 | | $ | 2,979 | | $ | 5,500 | | | Principal payments | | | (2,760) | | | - | | | (2,760) | | | Classification | | | 2,979 | | | (2,979) | | | - | | | Balance at Dec. 31, 2017 | | $ | 2,740 | | $ | - | | $ | 2,740 | | | Debt Discount | | Current | | Long-term | | Total | | | Balance at Jan. 1, 2017 | | $ | (98) | | $ | - | | $ | (98) | | | Amortization expense | | | 66 | | | - | | | 66 | | | Classification | | | - | | | - | | | - | | | Balance at Dec. 31, 2017 | | $ | (32) | | $ | - | | $ | (32) | | | Deferred Debt Issuance Costs | | Current | | Long-term | | Total | | | Balance at Jan. 1, 2017 | | $ | (47) | | $ | - | | $ | (47) | | | Amortization expense | | | 33 | | | - | | | 33 | | | Classification | | | - | | | - | | | - | | | Balance at Dec. 31, 2017 | | $ | (14) | | $ | - | | $ | (14) | | | | | | | | | | | | | | | Current Debt, net at Dec. 31, 2017 | | $ | 2,694 | | $ | - | | $ | 2,694 | |
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