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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Major Customer [Line Items]
Total revenues	$ 28,075	$ 26,411	$ 58,959	$ 54,840
United States
Revenue, Major Customer [Line Items]
Total revenues	15,974	15,244	33,092	31,469
United Kingdom
Revenue, Major Customer [Line Items]
Total revenues	5,159	4,703	11,019	9,623
Germany
Revenue, Major Customer [Line Items]
Total revenues	2,632	2,659	6,291	6,165
Rest of the world
Revenue, Major Customer [Line Items]
Total revenues	$ 4,310	$ 3,805	$ 8,557	$ 7,583

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 22
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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