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INCOME TAXES (Summary of Components of Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred Tax Assets |  |
Deferred revenue and customer advances, net | $ 27 | $ 663
Prepaid expense | 28 |
Net operating loss carryforward | 164,512 | 165,408
Tax credit carryforwards | 32,958 | 60,807
Writedown/amortization of intangible assets and goodwill | 241 | 1,421
Fixed assets | 3,500 | 3,448
Demo equipment income | 4,439 | 4,415
Other | 14,205 | 13,230
Total Deferred Tax Assets | 219,910 | 249,392
Deferred Tax Liabilities |  |
Prepaid expense |  | (29)
Allowance and reserves | (10,671) | (9,689)
Accrued warranties | (302) | (330)
Total Deferred Tax Liabilities | (10,973) | (10,048)
Total Net Deferred Tax Assets | 208,937 | 239,344
Less: Valuation Allowance | (206,630) | (236,332)
Total Net Deferred Tax Assets | $ 2,307 | $ 3,012

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