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Revenue | 12 Months Ended
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Dec. 31, 2019
Revenue |
Revenue | 7. Revenue We disaggregate revenue from contracts with customers into three revenue categories: (i) product revenues, (ii) rental revenues and (iii) field service and other revenues. We have predominately domestic operations, with a small amount of sales being generated in Australia. For the year ended December 31, 2019, we derived 57% of our total revenues from the sale of our products, 22% of our total revenues from rental and 21% of our total revenues from field service and other. This compares to 53% of our total revenues from the sale of our products, 25% of our total revenues from rental and 22% of our total revenues from field service and other for the year ended December 31, 2018. In 2017, we derived 55% of our total revenues from the sale of our products, 23% from rental and 22% from field service and other. The following table presents our revenues disaggregated by category:
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Product revenue |  | $ | 357,087 |  | $ | 290,496 |  | $ | 189,091
Rental revenue |  |  | 141,816 |  |  | 133,418 |  |  | 77,469
Field service and other revenue |  |  | 129,511 |  |  | 120,221 |  |  | 74,631
Total revenue |  | $ | 628,414 |  | $ | 544,135 |  | $ | 341,191
At December 31, 2019, we had a deferred revenue balance of $1.4 million compared to the December 31, 2018 balance of $1.1 million included in accrued expenses and other current liabilities in the consolidated balance sheets. Deferred revenue represents our obligation to transfer products or perform services to a customer for which we have received cash or billed in advance. The revenue that has been deferred will be recognized upon product delivery or as services are performed. As of December 31, 2019, we did not have any contracts with an original length of greater than a year from which revenue is expected to be recognized in the future related to performance obligations that are unsatisfied.

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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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