CONSOLIDATED AND CONDENSED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net revenue	$ 2,330,063	$ 1,944,829
Cost of goods sold	1,750,940	1,474,373
Gross profit	579,123	470,456
Operating expenses:
Customer service and merchant fees	89,463	76,473
Advertising	275,760	243,969
Selling, operations, technology, general and administrative	475,968	343,648
Total operating expenses	841,191	664,090
Loss from operations	(262,068)	(193,634)
Interest (expense), net	(22,218)	(9,238)
Other (expense) income, net	(246)	3,078
Loss before income taxes	(284,532)	(199,794)
Provision for income taxes, net	1,333	595
Net loss	$ (285,865)	$ (200,389)
Net loss per share, basic and diluted (in dollars per share)	$ (3.04)	$ (2.20)
Weighted average number of common stock outstanding used in computing per share amounts, basic and diluted (in shares)	94,089	91,104