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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2018 and 2017:

Three months ended September 30, Nine months ended September 30,  
(in thousands)
(in thousands)
2018201720182017
Compressors - sales
$2,891 $2,683 $9,454 $11,303 
Flares - sales
336 679 1,827 1,510 
Other (Parts/Rebuilds) - sales
720 896 2,046 2,487 
Service and maintenance 1
5,221 4,878 15,022 14,959 
Total revenue from contracts with customers
9,168 9,136 28,349 30,259 
Add: non-ASC 606 rental revenue
7,228 6,777 20,969 20,774 
Total revenue
$16,396 $15,913 $49,318 $51,033 

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 September 30, 2018 and December 31, 2017, we had the following receivables and deferred income from contracts with customers: 

September 30, 2018December 31, 2017
(in thousands)
Accounts Receivable
Accounts receivable - contracts with customers $5,313 $5,454 
Accounts receivable - non-ASC 606 3,208 3,649 
Total Accounts Receivable
$8,521 $9,103 
Less: Allowance for doubtful accounts $(405)$(569)
Total Accounts Receivable, net
$8,116 $8,534 
Deferred income
$134 $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
$559 $1,773 $1,375 $1,375 $462 $5,544 
(1) For the three months starting October 2019.