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Segment and Geographic Information - Segment Operating Results (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Total revenue	$ 134,214	$ 106,408
Stock-based compensation expense	(11,402)	(8,714)
Depreciation and amortization	(3,944)	(2,324)
Amortization of intangible assets	(176)	(547)
Restructuring charges	(2,431)	0
Other income, net	150	373
Income (loss) before provision for (benefit from) income taxes	(492)	1,404
Amortization of internally developed software	2,806	1,501
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	134,214	106,408
Segment profit (loss)	32,597	26,064
Operating Segments | Medicare
Segment Reporting Information [Line Items]
Total revenue	121,021	96,151
Segment profit (loss)	24,545	23,136
Operating Segments | Individual, Family and Small Business
Segment Reporting Information [Line Items]
Total revenue	13,193	10,257
Segment profit (loss)	8,052	2,928
Corporate
Segment Reporting Information [Line Items]
Segment profit (loss)	$ (15,286)	$ (13,448)

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