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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective income tax rate |  | (4.00%) | 41.00% | 32.00%
Provision to return adjustments |  | $ 78,000 | $ (59,000) | $ (86,000)
Reversal in uncertain tax positions |  | (67,000) | (153,000) | (869,000)
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations |  | $ 254,000 | $ 227,000 | $ 904,000
Federal statutory income tax rate |  | 34.00% | 35.00% | 34.00%
Valuation allowances against deferred tax assets |  | $ 2,469,000 | $ 2,157,000 |
Net deferred tax liability |  | 28,821,000 | 7,000 |
Federal net operating loss carryforwards related to the acquisitions of Cardiogenesis and Hemosphere |  | 3,400,000 |  |
State net operating loss carryforwards |  | 2,800,000 |  |
Research and development tax credit carryforwards |  | 490,000 |  |
Total uncertain tax liability including interest and penalties |  | 4,600,000 | 3,600,000 |
Uncertain tax liability recorded as reduction to deferred tax assets |  | 146,000 | 234,000 |
Uncertain tax liability recorded to non-current liability |  | 4,500,000 | $ 3,400,000 |
Approximate amount of uncertain tax liability to be recognized in 2018 |  | 817,000 |  |
Approximate amount that would affect tax rate |  | $ 433,000 |  |
Plan [Member] |  |  |  |
Federal statutory income tax rate | 21.00% |  |  |
Research [Member] |  |  |  |
Tax credit carryforwards expiration date |  | Dec. 31, 2022 |  |
Texas Tax Credit [Member] |  |  |  |
Other tax credit |  | $ 164,000 |  |
Federal [Member] |  |  |  |
Operating loss carryforwards expiration date |  | Dec. 31, 2018 |  |
State [Member] |  |  |  |
Operating loss carryforwards expiration date |  | Dec. 31, 2022 |  |
Texas [Member] | State [Member] |  |  |  |
Tax credit carryforwards expiration date |  | Dec. 31, 2027 |  |

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