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Segment reporting and concentrations (Details Textual)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	10.00%	10.00%
Foreign Customer [Member] | Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	51.00%	47.00%	35.00%
Foreign Customer [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	62.00%	49.00%
Two clients [Member] | Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	33.00%	31.00%	26.00%
Four Clients [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	68.00%	58.00%
One Other Client [Member] | Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	10.00%	10.00%	11.00%
Concentration Risk, Customer	less than 10%
Fourth Client [Member] | Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	10.00%	10.00%	15.00%
Concentration Risk, Customer	less than 10%

X

- Definition

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6327-108592

+ Details

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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

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X

- 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.

+ Details

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- Details

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