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Segment and Geographic Information (Revenue by Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 45,231	$ 39,672	$ 86,504	$ 75,612
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	35,534	30,872	68,802	59,144
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	5,688	5,408	10,877	10,169
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,785	3,262	6,436	5,990
Other International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	224	130	389	309
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 9,697	$ 8,800	$ 17,702	$ 16,468

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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