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Segment Reporting and Significant Customer Information - Revenue for Individual Countries that Exceed 10% of Total 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
Revenue, Major Customer [Line Items]
Revenues	$ 27,062	$ 25,301	$ 28,075	$ 30,884	$ 26,997	$ 24,687	$ 26,411	$ 28,429	$ 111,322	$ 106,524	$ 114,263
United States
Revenue, Major Customer [Line Items]
Revenues									61,257	59,812	62,456
United Kingdom
Revenue, Major Customer [Line Items]
Revenues									21,034	19,113	22,263
Germany
Revenue, Major Customer [Line Items]
Revenues									12,257	12,226	12,576
Rest of the world
Revenue, Major Customer [Line Items]
Revenues									$ 16,774	$ 15,373	$ 16,968

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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