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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
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 - sales969 562 1,491 831 
Other (Parts/Rebuilds) - sales679 866 1,326 1,593 
Service and maintenance 1
4,964 4,959 9,801 10,075 
Total revenue from contracts with customers11,347 9,367 19,182 21,119 
Add: non-ASC 606 rental revenue6,857 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, 2018December 31, 2017
(in thousands)
Accounts Receivable
Accounts receivable - contracts with customers$7,001 $5,454 
Accounts receivable - non-ASC 6062,817 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.