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Segment and Geographical Information International Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
International revenue									$ 128,542	$ 105,719	$ 96,502
Revenues	$ 52,613	$ 49,075	$ 47,426	$ 47,910	$ 46,344	$ 41,937	$ 40,406	$ 40,129	$ 197,024	$ 168,816	$ 153,276
percentage of total revenue									100.00%	100.00%	100.00%
International Revenue [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
percentage of total revenue									65.00%	63.00%	63.00%
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 68,482	$ 63,097	$ 56,774
percentage of total revenue									35.00%	37.00%	37.00%
South America and Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 18,378	$ 13,645	$ 9,335
percentage of total revenue									9.00%	8.00%	6.00%
North and South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 86,860	$ 76,742	$ 66,109
percentage of total revenue									44.00%	45.00%	43.00%
GERMANY
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 20,171	$ 17,421	$ 10,042
percentage of total revenue									10.00%	10.00%	7.00%
The Rest of Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 40,776	$ 33,852	$ 34,613
percentage of total revenue									21.00%	20.00%	23.00%
Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 32,090	$ 26,528	$ 30,457
percentage of total revenue									16.00%	16.00%	20.00%
Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 15,092	$ 11,437	$ 10,567
percentage of total revenue									8.00%	7.00%	7.00%
Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 2,035	$ 2,836	$ 1,488
percentage of total revenue									1.00%	2.00%	1.00%

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ 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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