Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net loss	$ (813,634)	$ (207,403)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	94,326	53,255
Provision for severance benefits	66,028	29,892
Equity-based compensation	137,312	16,725
Paid-in-kind interest and accretion of discount on convertible notes	20,148	42,818
Inventory and fixed asset losses due to fulfillment center fire	284,825	0
Non-cash operating lease expense	121,779	62,684
Non-cash others	17,406	24,621
Change in operating assets and liabilities:
Accounts receivable, net	(62,381)	(1,797)
Inventories	(267,191)	(208,086)
Other assets	(79,439)	(62,410)
Accounts payable	396,485	324,738
Accrued expenses	9,778	(7,680)
Deferred revenue	9,136	13,617
Other liabilities	(87,044)	(6,264)
Net cash (used in) provided by operating activities	(152,466)	74,710
Investing activities:
Purchases of property and equipment	(315,496)	(101,123)
Proceeds from sale of property and equipment	125	222
Other investing activities	9,790	2,164
Net cash used in investing activities	(305,581)	(98,737)
Financing activities:
Proceeds from issuance of Class A common stock upon initial public offering, net of underwriting discounts	3,431,277	0
Deferred offering costs paid	(11,618)	0
Repurchase of common units and preferred units	0	(97,043)
Proceeds from issuance of common stock/units, equity-based compensation plan	49,737	8,062
Proceeds from short-term borrowings and long-term debt	115,408	158,907
Repayment of short-term borrowings and long-term debt	(27,465)	(15,253)
Other financing activities	(981)	(893)
Net cash provided by financing activities	3,556,358	53,780
Effect of exchange rate changes on cash and cash equivalents, and restricted cash	(38,928)	(28,422)
Net increase in cash and cash equivalents, and restricted cash	3,059,383	1,331
Cash and cash equivalents, and restricted cash, as of beginning of period	1,401,302	1,371,535
Cash and cash equivalents, and restricted cash, as of end of period	4,460,685	1,372,866
Supplemental disclosure of cash-flow information:
Cash paid for income taxes (net of refunds)	(267)	82
Cash paid for interest	8,085	10,865
Non-cash investing and financing activities:
(Decrease) increase in property and equipment-related accounts payable and accrued expenses	(8,738)	48,751
Conversion of common units into Class A and Class B common stock	87,064	0
Conversion of redeemable convertible preferred units into Class A and Class B common stock	3,465,611	0
Conversion of convertible notes into Class A common stock	$ 609,999	$ 0