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Segment and Geographic Information (Revenue by Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 46,062	$ 42,150	$ 45,231	$ 41,273	$ 41,157	$ 38,340	$ 39,672	$ 35,940	$ 174,716	$ 155,109	$ 129,755
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									138,387	122,385	102,212
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									21,901	19,772	17,180
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									13,616	12,223	9,510
Other International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									812	729	853
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 36,329	$ 32,724	$ 27,543

X

- Definition

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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+ References

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