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Segment and Geographic Information - Summary of Operations by Segment and Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment revenue:
Revenue	$ 158,153	$ 150,462	$ 145,031	$ 135,270	$ 126,090	$ 119,125	$ 110,296	$ 98,575	$ 588,916	$ 454,086	$ 316,861
Segment income (loss) from operations:
Total income from operations	$ 13,635	$ 9,704	$ 3,548	$ 7,435	$ 6,902	$ 5,877	$ 3,953	$ 6,459	34,322	23,191	15,274
United States
Segment revenue:
Revenue									555,007	437,166	307,472
Segment income (loss) from operations:
Total income from operations									73,872	58,387	41,586
International
Segment revenue:
Revenue									33,909	16,920	9,389
Segment income (loss) from operations:
Total income from operations									$ (39,550)	$ (35,196)	$ (26,312)

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

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