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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Effective income tax rate | 41.00% | 32.00% | 16.00%
Reversal in uncertain tax positions | $ (153,000) | $ (869,000) | $ (781,000)
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations | $ 227,000 | $ 904,000 | $ 490,000
Federal statutory income tax rate | 35.00% | 34.00% | 34.00%
Valuation allowances against deferred tax assets | $ 2,157,000 | $ 2,109,000 |
Net deferred tax liability | 7,000 |  |
Net deferred tax asset |  | 18,188,000 |
Federal net operating loss carryforwards related to the acquisitions of Cardiogenesis and Hemosphere | 6,300,000 |  |
State net operating loss carryforwards | 2,400,000 |  |
Research and development tax credit carryforwards | 702,000 |  |
Total uncertain tax liability including interest and penalties | 3,600,000 | 1,200,000 |
Uncertain tax liability recorded as reduction to deferred tax assets | 234,000 | 104,000 |
Uncertain tax liability recorded to non-current liability | 3,400,000 | $ 1,100,000 |
Approximate amount of uncertain tax liability to be recognized in 2017 | $ 235,000 |  |
Research [Member] |  |  |
Tax credit carryforwards expiration date | Dec. 31, 2022 |  |
Texas Tax Credit [Member] |  |  |
Other tax credit | $ 150,000 |  |
Federal [Member] |  |  |
Operating loss carryforwards expiration date | Dec. 31, 2017 |  |
State [Member] |  |  |
Operating loss carryforwards expiration date | Jan. 01, 2016 |  |
Texas [Member] | State [Member] |  |  |
Tax credit carryforwards expiration date | Dec. 31, 2027 |  |

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