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Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Taxes |  |
Deferred revenue | $ 21 | $ 36
Basis difference in intangible assets | 2,994 | 3,157
Inventory reserve | 2,434 | 2,247
Net operating loss carryforwards | 3,605 | 6,438
Research and development tax credits | 1,272 | 1,042
Accrued expenses | 61 | 163
Stock-based compensation | 309 | 322
Allowance for sales returns and doubtful accounts | 128 | 107
Difference in property and equipment basis | (145) | (134)
Other | 479 | 382
Total net deferred income tax asset | 11,158 | 13,760
Less: Valuation allowance | (11,158) | (13,760)
Net deferred income tax asset (liability) |  |

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