Revenue From Contracts With Customers - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Time period of contractual future performance obligations for which value not disclosed (or less)	1 year
Net revenues	$ 33,508	$ 32,556
Latin America
Disaggregation of Revenue [Line Items]
Net revenues	9,852	6,585
North America
Disaggregation of Revenue [Line Items]
Net revenues	8,048	7,395
Europe
Disaggregation of Revenue [Line Items]
Net revenues	5,549	5,636
Africa
Disaggregation of Revenue [Line Items]
Net revenues	5,019	560
Asia Pacific
Disaggregation of Revenue [Line Items]
Net revenues	3,934	4,823
Middle East
Disaggregation of Revenue [Line Items]
Net revenues	749	580
CIS
Disaggregation of Revenue [Line Items]
Net revenues	357	6,977
Operations Optimization
Disaggregation of Revenue [Line Items]
Net revenues	8,940	9,246
Operations Optimization \| Optimization Software & Services
Disaggregation of Revenue [Line Items]
Net revenues	$ 4,782	$ 4,256
Operations Optimization \| Optimization Software & Services \| Minimum
Disaggregation of Revenue [Line Items]
Time period of contractual future performance obligations	2 years
Operations Optimization \| Optimization Software & Services \| Maximum
Disaggregation of Revenue [Line Items]
Time period of contractual future performance obligations	5 years

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+ References

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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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