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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% |  |

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- 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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- 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 + Details
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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. + Details
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- Details
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- Details
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