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Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Income Taxes |  |
Deferred revenue | $ 1 | $ 3
Basis difference in intangible assets | 5,473 | 6,080
Inventory reserve | 1,040 | 880
Net operating loss carryforwards | 7,025 | 4,730
Research and development tax credits | 125 | 115
Accrued expenses | 99 | 108
Stock-based compensation | 167 | 210
Allowance for sales returns and doubtful accounts | 101 | 81
Difference in property and equipment basis | (94) | (108)
Convertible debt | (110) | (110)
Capitalized research expenditure | 1,839 | 1,507
Other | 309 | 337
Total net deferred income tax asset | 15,975 | 13,833
Less: Valuation allowance | (15,975) | (13,833)
Net deferred income tax asset (liability) | $ 0 | $ 0

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