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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets (liabilities) |  |
Accrued expenses | $ 8,346 | $ 7,981
Net operating loss and credit carryforward | 20,145 | 20,087
Allowance, reserves and other | 1,381 | 1,984
Stock-based compensation | 3,379 | 3,257
Lease liability | 2,427 | 1,627
Deferred tax assets | 35,678 | 34,936
Property, plant, and equipment | (4,805) | (2,961)
Intangible amortization | (14,292) | (16,192)
Right-of-use asset | (2,139) | (1,418)
Deferred tax liabilities | (21,236) | (20,571)
Total | $ 14,442 | $ 14,365

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