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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

Revenue recognition.

+ References

No definition available.

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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

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