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Revenue - Summary of Revenues by Revenue Stream (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 65,189 | $ 62,868 | $ 61,091 | $ 59,092 | $ 58,057 | $ 56,057 | $ 54,092 | $ 51,879 | $ 248,240 | $ 220,085 | $ 193,153
Recurring Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 230,654 | 203,920 | 177,057
One-time Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 17,586 | 16,165 | 16,096
Fulfillment [Member] | Recurring Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 190,783 | 164,682 | 139,645
Analytics [Member] | Recurring Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 34,447 | 34,260 | 32,938
Other [Member] | Recurring Revenues [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 5,424 | $ 4,978 | $ 4,474

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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