v3.3.1.900

Summary of significant accounting policies (Details 3) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) item segment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Goodwill |  |  |
Number of reporting units | item | 1 |  |
Number of operating segments | 1 |  |
Number of reportable segments | 1 |  |
Impairment loss | $ | $ 0 | $ 0 | $ 0
Software | Minimum |  |  |
Property and equipment |  |  |
Estimated useful lives | 2 years |  |
Software | Maximum |  |  |
Property and equipment |  |  |
Estimated useful lives | 5 years |  |
Computer equipment | Minimum |  |  |
Property and equipment |  |  |
Estimated useful lives | 2 years |  |
Computer equipment | Maximum |  |  |
Property and equipment |  |  |
Estimated useful lives | 5 years |  |
Furniture, fixtures and office equipment | Minimum |  |  |
Property and equipment |  |  |
Estimated useful lives | 3 years |  |
Furniture, fixtures and office equipment | Maximum |  |  |
Property and equipment |  |  |
Estimated useful lives | 5 years |  |
Leasehold improvements | Minimum |  |  |
Property and equipment |  |  |
Estimated useful lives | 2 years |  |
Leasehold improvements | Maximum |  |  |
Property and equipment |  |  |
Estimated useful lives | 15 years |  |

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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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