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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