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INCOME TAXES - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax asset: |  |
Capitalized technology license and patents | $ 580 | $ 560
Capitalized research expenditures | 4,291 | 3,319
Accruals and reserves | 4,178 | 4,130
Retirement plan | 15,444 | 11,363
Deferred revenue | 16,834 | 14,354
Tax credit carry forwards | 4,589 | 3,997
Stock-based compensation | 1,059 | 1,884
Other | 1,914 | 1,682
Deferred Tax Assets, Gross | 48,889 | 41,289
Valuation allowance | (4,560) | (3,368)
Deferred tax assets | 44,329 | 37,921
Deferred tax liability: |  |
Accruals and reserves | (6,634) | (7,546)
Deferred tax liabilities | (6,634) | (7,546)
Net deferred tax assets | $ 37,695 | $ 30,375

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