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INCOME TAXES (Details 3) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Long-term deferred tax assets (liabilities): |  |
Accrued expenses | $ 25 | $ 51
Deferred Revenue | 217 | 322
Accounts receivable | 19 | 907
Prepaid Expenses | (9) | (15)
Inventory | 92 | 20
Stock based compensation | 137 | 108
Tax Credits and NOL Carryforward | 1,141 | 4,314
Other | 6 | 9
Long-term deferred tax assets (liabilities): |  |
Property and equipment, assets | 35 |
Property and equipment, liabilities |  | (115)
Amortization | 64 | 105
Long-term deferred tax assets (liabilities) | 1,727 | 5,706
Less: Valuation allowance | (1,727) | (5,706)
Net deferred tax assets (liabilities) | $ 0 | $ 0

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