Revenue - Disaggregated Revenues and Cost to Obtain a Contract (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of revenues
Total revenues, gross	$ 276,932	$ 242,440	$ 519,406	$ 476,629
Deferred revenues adjustment	(3,432)	(131)	(5,314)	(295)
Revenues	273,500	242,309	514,092	476,334
Subscription revenues
Disaggregation of revenues
Total revenues, gross	216,569	202,747	409,804	395,239
Transaction revenues
Disaggregation of revenues
Total revenues, gross	$ 60,363	$ 39,693	$ 109,602	$ 81,390

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration