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Other Financial Statement Information (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Supplemental Cash Flow Information: |  |
Cash paid for interest | $ 640 | $ 363
Cash paid for taxes | 5 | 11
Non-Cash Investing and Financing Activities |  |
Noncash preferred stock dividends | 246 | 463
Issuance of notes in exchange for accounts payable |  | 288
Issuance of stock upon conversion of preferred stock | 2,246 | 307
Issuance of warrants with term loan extensions | 2,218 | 361
Issuance of stock in exchange for accounts payable |  | $ 86

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