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Revenue Recognition
 6 Months Ended
Jun. 30, 2022
Revenue from Contract with Customer [Abstract]  
Revenue Recognition Revenue Recognition
Sources of Revenue
We have identified the following revenues disaggregated by revenue source:
•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 three and six months ended June 30, 2022 and 2021 the sources of revenue were as follows (in thousands):
Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
Domestic hospitals$39,508$38,932$76,501$75,161
International hospitals27,23527,63855,64953,765
International distributors12,1529,50423,21618,146
CardioGenesis cardiac laser therapy1,445742,187163
Total sources of revenue$80,340$76,148$157,553$147,235
Also see segment disaggregation information in Note 13 below.
Contract Balances
We may generate contract assets during the pre-delivery design and manufacturing stage of E-xtra Design Engineering product order fulfillment. We assess the balance related to any arrangements in process and determine if the enforceable right to payment creates a material contract asset requiring disclosure. No material arrangements in process existed as of June 30, 2022 and 2021.
We also incur contract obligations on general customer purchase orders that have been accepted but unfulfilled. Due to the short duration of time between order acceptance and delivery of the related product or service, we have determined that the balance related to these contract obligations is generally immaterial at any point in time. We monitor the value of orders accepted but unfulfilled at the close of each reporting period to determine if disclosure is appropriate. The value of orders accepted but unfulfilled as of June 30, 2022 and 2021 was not material.