Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue	$ 550,700	$ 388,224	$ 249,522
Costs and operating expenses:
Cost of revenue, exclusive of depreciation and amortization presented separately below	29,587	14,016	6,035
Product development and technology	61,816	29,300	43,894
Sales and marketing	255,135	176,967	104,177
General and administrative	461,451	14,692	8,359
Depreciation and amortization	18,430	13,573	9,806
Total costs and operating expenses	826,419	248,548	172,271
Operating (loss) income	(275,719)	139,676	77,251
Other (income) expense:
Other (income) expense, net	(22)	2,967	7
Loss on extinguishment of debt		4,877	2,857
Interest income	(160)	(715)	(154)
Interest expense	27,913	49,569	22,193
Total other expense, net	27,731	56,698	24,903
(Loss) income before income taxes	(303,450)	82,978	52,348
Income tax benefit (expense)	9,827	(16,930)	(8,555)
Net (loss) income	(293,623)	66,048	43,793
Net (loss) income attributable to common stockholders
Basic	(293,623)	42,441	13,795
Diluted	$ (293,623)	$ 42,745	$ 14,226
(Loss) earnings per share:
(Loss) earnings per share - basic	$ (1.07)	$ 0.19	$ 0.12
(Loss) earnings per share - diluted	$ (1.07)	$ 0.18	$ 0.12
Weighted average shares used in computing (loss) earnings per share:
Basic	274,696	226,607	111,842
Diluted	274,696	231,209	118,344
Cost of Sales
Stock-based compensation included in costs and operating expenses:
Total stock-based compensation	$ 184	$ 28
Research and Development Expense
Stock-based compensation included in costs and operating expenses:
Total stock-based compensation	10,937	1,775	$ 1,048
Selling and Marketing Expense
Stock-based compensation included in costs and operating expenses:
Total stock-based compensation	8,789	1,268	544
General and Administrative Expense
Stock-based compensation included in costs and operating expenses:
Total stock-based compensation	$ 377,375	$ 676	$ 170