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Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Income Taxes |  |
Deferred revenue | $ 9 | $ 21
Basis difference in intangible assets | 1,319 | 2,994
Inventory reserve | 2,377 | 2,434
Net operating loss carryforwards | 7,121 | 3,605
Research and development tax credits | 1,579 | 1,272
Accrued expenses | 43 | 61
Stock-based compensation | 308 | 309
Allowance for sales returns and doubtful accounts | 83 | 128
Difference in property and equipment basis | (124) | (145)
Other | 469 | 479
Total net deferred income tax asset | 13,184 | 11,158
Less: Valuation allowance | (13,184) | (11,158)
Net deferred income tax asset (liability) |  |

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