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Basis of Presentation and Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2018
Accounting Policies [Abstract] |
Disaggregation of Revenue | The following table shows the Company's revenue disaggregated by product or service type for the three and six months ended June 30, 2018 and 2017:
| Three months ended June 30, |  |  |  | Six months ended June 30, |  |
| (in thousands) |  |  |  | (in thousands) |  |
| 2018 |  | 2017 |  | 2018 |  | 2017
Compressors - sales | $ | 4,735 |  | $ | 2,980 |  | $ | 6,564 |  | $ | 8,620
Flares - sales | 969 |  | 562 |  | 1,491 |  | 831
Other (Parts/Rebuilds) - sales | 679 |  | 866 |  | 1,326 |  | 1,593
Service and maintenance 1 | 4,964 |  | 4,959 |  | 9,801 |  | 10,075
Total revenue from contracts with customers | 11,347 |  | 9,367 |  | 19,182 |  | 21,119
Add: non-ASC 606 rental revenue | 6,857 |  | 6,851 |  | 13,740 |  | 14,001
Total revenue | $ | 18,204 |  | $ | 16,218 |  | $ | 32,922 |  | $ | 35,120
1Service and maintenance includes revenue from servicing our own rental equipment contracted to customers and third party equipment.
Schedule of Contract with Customer, Asset and Liability | As of June 30, 2018 and December 31, 2017, we had the following receivables and deferred income from contracts with customers:
| June 30, 2018 |  | December 31, 2017
| (in thousands) |  |
Accounts Receivable |  |  |
Accounts receivable - contracts with customers | $ | 7,001 |  | $ | 5,454
Accounts receivable - non-ASC 606 | 2,817 |  | 3,649
Total Accounts Receivable | $ | 9,818 |  | $ | 9,103
Less:Allowance for doubtful accounts | $ | (443) |  | $ | (569)
Total Accounts Receivable, net | $ | 9,375 |  | $ | 8,534
Deferred income | $ | 487 |  | $ | 185
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction | The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the end of the reporting period:
(in thousands) | 2019(1) | 2020 | 2021 | 2022 | 2023 | Total
Service and Maintenance | $ | 750 | $ | 1,173 | $ | 1,085 | $ | 1,085 | $ | 145 | $ | 4,238
(1) For the six months starting July 2019.

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045 + Details
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