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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Disaggregation of Revenue
The following table shows the Company's revenue disaggregated by product or service type for the years ended:
 
Year Ended December 31,
(in thousands)
2018
20172016
Compressors - sales
$10,994 $13,382 $10,038 
Flares - sales
2,535 2,755 1,183 
Other (Parts/Rebuilds) - sales
2,740 4,071 2,400 
Service and maintenance 1
20,537 19,857 24,016 
Total revenue from contracts with customers
36,806 40,065 37,637 
Add: non-ASC 606 rental revenue
28,672 27,628 34,017 
Total revenue
$65,478 $67,693 $71,654 

1Service and maintenance includes revenue from servicing our own rental equipment contracted to customers and third party equipment.
Contract with Customer, Asset and Liability
As of December 31, 2018 and December 31, 2017, we had the following receivables and deferred income from contracts with customers:


December 31, 2018December 31, 2017
(in thousands) 
Accounts Receivable 
Accounts receivable - contracts with customers $4,353 $5,454 
Accounts receivable - non-ASC 606 3,157 3,649 
Total Accounts Receivable 7,510 9,103 
Less: Allowance for doubtful accounts (291)(569)
Total Accounts Receivable, net 7,219 8,534 
Deferred income $81 $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) 2020 2021 2022 2023 2024 Total 
Service and Maintenance $2,223 $1,842 $1,763 $704 $— $6,532 
Schedule of Inventory At December 31, 2018 and 2017, inventory consisted of the following (in thousands):
  20182017
Raw materials - current$26,152 $22,813 
Raw materials - long term3,980 2,829 
Finished Goods1,022 1,022 
Work in process3,800 2,389 
Total$34,954 $29,053 
Summary of Rental Equipment and Property and Equipment The
majority of our property and equipment, including rental equipment, is a direct cost to generating revenue and the following table depicts the depreciation associated with each product line at December 31, 2018 , 2017 and 2015 (in thousands):

 201820172016
Rentals$21,588 $20,861 $21,325 
Sales265 265 291 
Service & Maintenance22 21 25 
Total$21,875 $21,147 $21,641 
Schedule of Identified Finite-Lived Intangible Assets, Finite Lived
The following table represents the identified intangible assets by major asset class (in thousands):

 December 31, 2018December 31, 2017
Useful Life (years) Gross Carrying Value  Accumulated Amortization Net Book Value Gross Carrying Value Accumulated Amortization Net Book Value 
Developed Technology20$2,505 $1,758 $747 $2,505 $1,633 $872 
Trade NameIndefinite 654 — 654 654 — 654 
Total$3,159 $1,758 $1,401 $3,159 $1,633 $1,526 
Schedule of Identified Indefinite-Lived Intangible Assets
The following table represents the identified intangible assets by major asset class (in thousands):

 December 31, 2018December 31, 2017
Useful Life (years) Gross Carrying Value  Accumulated Amortization Net Book Value Gross Carrying Value Accumulated Amortization Net Book Value 
Developed Technology20$2,505 $1,758 $747 $2,505 $1,633 $872 
Trade NameIndefinite 654 — 654 654 — 654 
Total$3,159 $1,758 $1,401 $3,159 $1,633 $1,526 
Computation of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share amounts):

  Year Ended December 31, 
  201820172016
Numerator:       
Net income $426 $19,851 $6,469 
Denominator for basic net income per common share:       
Weighted average common shares outstanding 12,965 12,831 12,702 
Denominator for diluted net income per share:       
Weighted average common shares outstanding 12,965 12,831 12,702 
Dilutive effect of stock options and restricted shares 268 279 233 
Diluted weighted average shares 13,233 13,110 12,935 
Earnings per common share:       
Basic $0.03 $1.55 $0.51 
Diluted $0.03 $1.51 $0.50