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

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