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Revenue - Contract balances (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018
Contract balances |  |
Receivables, inclusive of trade and unbilled | $ 48,217 | $ 42,534
Contract Assets (current and non-current) | 8,167 | 11,060
Contract Liabilities (Deferred Revenue current and non-current) | $ 33,752 | $ 33,598
Revenue, Practical Expedient, Financing Component [true/false] |  | true
Contract liabilities increase due to annual renewals |  | $ 2,900
Minimum |  |
Contract balances |  |
The amount of time contract assets are transferred to receivables |  | 3 years
Maximum |  |
Contract balances |  |
The amount of time contract assets are transferred to receivables |  | 5 years
Dealflo Limited |  |
Contract balances |  |
Deferred revenue |  | $ 1,700

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 + Details
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