Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended			24 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Tax Credit Carryforward [Line Items]
Effective income tax rate	32.00%	16.00%	31.00%
Reversal in uncertain tax positions	$ 869,000
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations	904,000	$ 490,000
Federal statutory income tax rate			35.00%	34.00%
Valuation allowances against deferred tax assets	2,109,000	2,145,000		$ 2,109,000
Net deferred tax asset	18,188,000	21,869,000		18,188,000
Federal net operating loss carryforwards related to the acquisitions of Cardiogenesis and Hemosphere	9,500,000			9,500,000
State net operating loss carryforwards	2,700,000			2,700,000
Research and development tax credit carryforwards	445,000			445,000
Total uncertain tax liability including interest and penalties	1,200,000	1,800,000		1,200,000
Uncertain tax liability recorded as reduction to deferred tax assets	104,000	108,000		104,000
Uncertain tax liability recorded to non-current liability	1,100,000	$ 1,700,000		1,100,000
Approximate amount of uncertain tax liability to be recognized in 2016	227,000			227,000
Texas Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Other tax credit	$ 154,000			$ 154,000