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CONVERTIBLE NOTES (Schedule of Interest Expense Recognized) (Details) - 2018 Notes [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Contractual interest expense | $ 139 | $ 501
Amortization of debt issuance costs and debt discount | 15 | 71
Gain from early redemption | (32) |
Total | $ 122 | $ 572

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