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Revenue Recognition | 6 Months Ended
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Jun. 30, 2019
Revenue Recognition [Abstract] |
Revenue Recognition | 10. 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, 2019 and 2018 the sources of revenue were as follows (in thousands):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018
| (Unaudited) |  | (Unaudited)
Domestic hospitals | $ | 36,344 |  | $ | 35,139 |  | $ | 71,955 |  | $ | 68,682
International hospitals |  | 22,532 |  |  | 21,902 |  |  | 43,102 |  |  | 40,951
International distributors |  | 10,365 |  |  | 9,877 |  |  | 19,975 |  |  | 17,887
CardioGenesis cardiac laser therapy |  | 1,898 |  |  | 1,578 |  |  | 3,612 |  |  | 2,924
Total sources of revenue | $ | 71,139 |  | $ | 68,496 |  | $ | 138,644 |  | $ | 130,444
Also see segment and geographic 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, 2019 and 2018. 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, 2019 and 2018 were not material.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 + Details
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