Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 84,086	$ 67,935	$ 237,624	$ 188,650
Costs and operating expenses:
Cost of revenue (exclusive of depreciation and amortization)	32,752	25,930	89,124	75,239
Sales and marketing	14,894	12,636	43,117	37,087
Research and product development	13,454	10,602	36,794	28,422
General and administrative	12,946	8,955	36,303	25,361
Depreciation and amortization	6,680	5,678	19,751	16,169
Total costs and operating expenses	80,726	63,801	225,089	182,278
Income from operations	3,360	4,134	12,535	6,372
Other income (expense), net	187,747	(11)	187,759	(68)
Interest expense, net	(853)	(400)	(1,909)	(1,324)
Income before provision for (benefit from) income taxes	190,254	3,723	198,385	4,980
Provision for (benefit from) income taxes	52,578	(1,255)	39,469	(26,874)
Net income	$ 137,676	$ 4,978	$ 158,916	$ 31,854
Net income per common share:
Basic (in dollars per share)	$ 4.01	$ 0.15	$ 4.64	$ 0.94
Diluted (in dollars per share)	$ 3.86	$ 0.14	$ 4.46	$ 0.90
Weighted average common shares outstanding:
Basic (in shares)	34,296	34,047	34,241	33,991
Diluted (in shares)	35,665	35,421	35,662	35,406