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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets (liabilities): |  |
Accrued expenses | $ 147 | $ 88
Deferred revenue | 129 | 287
Stock-based compensation | 420 | 449
Fixed assets | 116 | 287
Goodwill | 28 | 102
Inventory | 106 | 197
Intangible amortization | (80) | (1,777)
R&D credit | 2,154 | 2,154
Texas margin tax temporary credit | 74 | 139
Other | 101 | 62
Total deferred tax asset, net of deferred tax liabilities | 38,492 | 35,220
Valuation allowance | (38,492) | (35,220)
Net deferred tax asset | 0 | 0
Federal |  |
Deferred tax assets (liabilities): |  |
Tax benefit of operating loss carry forward | 28,459 | 26,902
State |  |
Deferred tax assets (liabilities): |  |
Tax benefit of operating loss carry forward | $ 6,429 | $ 6,225

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