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INCOME TAXES - Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Loss and credit carryforwards $ 8,771 $ 7,476
Stock-based compensation 2,890 2,381
Research and development capitalization 2,178 982
Accrued insurance deductibles 798 400
Interest expense limitation 599 0
Accrued bonuses 408 0
Deferred revenue 325 339
Inventory 263A adjustment 231 394
Lease liabilities 1,276 0
Other 556 553
Total deferred tax assets 18,032 12,525
Valuation allowance (16,443) (12,068)
Total deferred tax assets, net of valuation allowance 1,589 457
Deferred tax liabilities:    
Lease right-of-use assets (1,253) 0
Property and equipment (165) (205)
Other (171) (252)
Total deferred tax liabilities (1,589) (457)
Net deferred tax assets $ 0 $ 0