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CONVERTIBLE NOTES (Schedule of Interest Expense Recognized) (Details) - 2018 Notes [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Contractual interest expense | $ 139 | $ 501 | $ 2,943
Amortization of debt issuance costs and debt discount | 15 | 71 | 421
Gain from early redemption | (32) |  |
Total | $ 122 | $ 572 | $ 3,364

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