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DEBT - Future Payments (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt |  |
2019 (remainder of year) | $ 0 |
2020 | 0 |
2021 | 0 |
Total principal payments | 0 |
Less unamortized debt issuance costs | 0 | $ (20)
Total debt | 0 |
Capital leases |  |
2019 (remainder of the year) | 5 |
2020 | 24 |
2021 | 13 |
Total principal payments | 42 |
Total debt |  |
2019 (remainder of the year) | 5 |
2020 | 24 |
2021 | 13 |
Total principal payments | 42 |
Less unamortized debt issuance costs | 0 | $ (20)
Total debt | $ 42 |

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- Definition Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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