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Revenue - Contract balances (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2018
Contract balances |  |  |
Receivables, inclusive of trade and unbilled | $ 59,631 | $ 48,217 |
Contract Assets (current and non-current) | 11,278 | 8,167 | $ 11,278
Contract Liabilities (Deferred Revenue current and non-current) | $ 44,305 | $ 33,752 | $ 44,305
Revenue, Practical Expedient, Financing Component [true/false] |  |  | true
Contract liabilities increase due to annual renewals |  |  | $ 3,100
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 |  |  | $ 1,400

X
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- Definition Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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