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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 33,166 | $ 23,589
Intangible assets | 2,916 | 6,026
Tax credit carryforwards | 4,001 | 3,802
Goodwill | 5,284 | 4,087
Property and equipment | 3,229 | 3,640
Lease liability | 1,750 | 1,945
Inventory valuation reserves | 2,675 | 2,093
Allowance for doubtful accounts | 1,184 | 1,134
Accrued liabilities | 569 | 2,076
Accrued compensation | 401 | 657
Equity compensation | 399 | 435
Other | 304 | 353
Total gross deferred tax assets | 55,878 | 49,837
Valuation allowance | (54,875) | (48,671)
Total deferred tax assets, net | 1,003 | 1,166
Deferred tax liabilities: |  |
ROU asset | (453) | (686)
Prepaid insurance and other | (271) | (257)
Total gross deferred tax liabilities | (724) | (943)
Net deferred tax assets | $ 279 | $ 223

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