Revenue Recognition	12 Months Ended
	Dec. 31, 2021
Revenue Recognition [Abstract]
Revenue Recognition	14. Revenue Recognition Sources of Revenue Revenues are disaggregated by following sources: Domestic Hospitals – direct sales of products and preservation services.International Hospitals – direct sales of products and preservation services.International Distributors – generally these contracts specify a geographic area that the distributor will service, terms and conditions of the relationship, and purchase targets for the next calendar year.CardioGenesis Cardiac Laser Console Trials and Sales – CardioGenesis cardiac trialed laser consoles are delivered under separate agreements. For the years ended December 31, 2021, 2020, and 2019 the sources of revenue were as follows (in thousands): 2021 2020 2019Domestic hospitals$ 150,301 $ 137,810 $ 144,538International hospitals 106,639 80,524 85,241International distributors 41,046 34,429 40,427CardioGenesis cardiac laser therapy 850 464 6,016Total sources of revenue$ 298,836 $ 253,227 $ 276,222 Also see segment and geographic disclosure in Note 18 below.