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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Deferred tax liability associated with basis differences in discontinued operation |  |  | $ 17,100 |
Federal corporate income tax rate |  | 21.00% |  |
Valuation allowance increase amount | $ 500 |  |  |
Undistributed earnings of foreign subsidiaries | 0 |  | 0 | $ 0
Unrecognized tax benefits | 14,401 |  | 6,646 | 2,858
Unrecognized tax benefits that would impact effective tax rate | 13,000 |  | 5,800 |
Interest and penalties related to unrecognised tax benefits | $ 2,300 |  | 700 | $ 300
Maximum |  |  |  |
Limitations on the amount of taxable income that can be offset by net operating loss carryforwards and tax credits Percentage of change in control in ownership | 50.00% |  |  |
California |  |  |  |
Operating loss carryforwards,Expiration year | 2037 |  |  |
Internal Revenue Service (IRS) |  |  |  |
Operating loss carryforwards limitations on use | Internal Revenue Code Section 382 places a limitation on the amount of taxable income that can be offset by net operating loss carryforwards and tax credits after a greater than 50% change in control in ownership; California has similar rules. |  |  |
Not Subject to Expiration | California |  |  |  |
Tax credit carryforwards | $ 4,800 |  | 1,400 |
Tax Period Two Thousand And Thirty Seven | California |  |  |  |
Operating loss carryforwards net | 9,200 |  | 3,800 |
Tax Period Two Thousand Fourty | Texas Tax Authority |  |  |  |
Tax credit carryforwards | $ 300 |  | 0 |
Tax credit carryforwards,Expiration year | 2040 |  |  |
Tax Year 2017 |  |  |  |
Open tax year | 2017 |  |  |
Tax Year 2020 |  |  |  |
Open tax year | 2020 |  |  |
Domestic Tax Authority |  |  |  |
Tax credit carryforwards,Expiration year | 2035 |  |  |
Domestic Tax Authority | Not Subject to Expiration |  |  |  |
Operating loss carryforwards net | $ 19,600 |  | 2,800 |
Domestic Tax Authority | Tax Period Two Thousand Thirty Five |  |  |  |
Tax credit carryforwards | $ 900 |  | $ 0 |
Domestic Tax Authority | Tax Year 2020 |  |  |  |
Open tax year | 2020 |  |  |
Domestic Tax Authority | Tax Year 2016 |  |  |  |
Open tax year | 2016 |  |  |

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