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INCOME TAXES - Tax effects of temporary differences (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Accrued expenses | $ 34 | $ 37
Lease liability | 1,109 | 217
Accounts receivable | 19 | 18
Inventory | 232 | 117
Stock-based compensation | 145 | 138
Tax Credits and NOL Carryforward | 110 | 354
Other | 1 | 150
Amortization | 50 | 57
Total deferred tax assets | 1,700 | 1,088
Less: Valuation allowance |  | (172)
Deferred tax assets | 1,700 | 916
Deferred tax liabilities: |  |
Property and equipment | (192) | (176)
Finance lease | (45) |
Right-of-use asset | (946) |
Prepaid expenses | (4) | (15)
Deferred tax liabilities | (1,187) | (191)
Net deferred tax assets | $ 513 | $ 725

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