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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Effective income tax rate |  | (3.00%) | (5.00%)
Federal statutory income tax rate | 21.00% |  |
Valuation allowances against deferred tax assets | $ 13,282,000 | $ 7,170,000 |
Net deferred tax liability | 26,442,000 | 33,266,000 |
Income tax expense | 7,000 | (492,000) | $ (76,000)
Federal net operating loss carryforwards related to the acquisitions of Cardiogenesis and Hemosphere | 2,000,000.0 |  |
State net operating loss carryforwards | 3,000,000.0 |  |
Foreign net operating loss carryforwards | 1,800,000 |  |
Research and development tax credit carryforwards | 500,000 |  |
Other tax credit | $ 110,000 |  |
Other tax credit expiration date | Dec. 31, 2027 |  |
Tax credit carryforwards expiration date | Dec. 31, 2030 |  |
Excess interest carryforward | $ 3,547,000 | 2,660,000 |
Non-current liabilities recorded related to interest and penalties on uncertain tax positions | 220,000 | 261,000 |
Penalties and interest income (expense) | 35,000 | 180,000 | (27,000)
Total uncertain tax liability including interest and penalties | 4,300,000 | 2,800,000 |
Uncertain tax liability recorded as reduction to deferred tax assets | 300,000 | 300,000 |
Uncertain tax liability recorded to non-current liability | 4,000,000.0 | 2,500,000 |
Approximate amount of uncertain tax liability to be recognized | 185,000 |  |
Approximate amount that would affect tax rate | 3,200,000 | 2,600,000 | $ 3,500,000
Interest deduction limit | 11,700,000 | $ 15,800,000 |
Correction In Calculation Of Valuation Allowance And Uncertain Tax Position [Member] |  |  |
Income tax expense | $ 2,100,000 |  |
State [Member] |  |  |
Operating loss carryforwards expiration date | Dec. 31, 2022 |  |
Foreign Authority [Member] |  |  |
Net deferred tax liability | $ 175,000 |  |
Operating loss carryforwards expiration date | Dec. 31, 2025 |  |

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