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Segment and Geographic Information - Summary of Operations by Segment and Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment revenue:
Revenue	$ 150,462	$ 119,125	$ 430,763	$ 327,996
Segment income (loss) from operations:
Total income from operations	9,704	5,877	20,687	16,289
United States
Segment revenue:
Revenue	141,637	114,677	407,050	316,108
Segment income (loss) from operations:
Total income from operations	19,956	14,456	51,456	40,384
International
Segment revenue:
Revenue	8,825	4,448	23,713	11,888
Segment income (loss) from operations:
Total income from operations	$ (10,252)	$ (8,579)	$ (30,769)	$ (24,095)

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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://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
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-Topic 606
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