Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net loss	$ (356,223)	$ (197,154)
Adjustments to reconcile net loss including noncontrolling interests to net cash provided by operations:
Depreciation and amortization	53,439	30,232
Stock-based compensation expense	221,722	62,962
Change in fair value of warrants	0	1,890
Operating lease non-cash expense	31,936
Other non-cash charges/(credits)	1,137	1,271
Changes in operating assets and liabilities:
Accounts receivable	77,086	(67,184)
Accounts payable	(230)	6,163
Prepaid expenses and other current assets	(19,501)	(3,549)
Other assets	(4,188)	1,359
Developer exchange liability	36,844	21,623
Accrued expenses and other current liabilities	38,098	10,430
Other long-term liability	(1,022)	2,221
Operating lease liabilities	(24,055)	0
Deferred revenue	616,375	630,870
Deferred cost of revenue	(134,532)	(155,798)
Net cash provided by operating activities	536,886	345,336
Cash flows from investing activities:
Acquisition of property and equipment	(48,331)	(52,262)
Payments related to business combination, net of cash acquired	(45,692)	0
Purchases of short-term investments	0	(5,991)
Maturities of short-term investments	0	54,000
Purchases of intangible assets	(7,856)	(451)
Net cash used in investing activities	(101,879)	(4,704)
Cash flows from financing activities:
Proceeds from issuance of preferred stock for warrant exercises	0	147
Proceeds from issuance of common stock	62,278	9,654
Net proceeds from issuance of preferred stock	534,286	149,669
Net cash provided by financing activities	596,564	159,470
Effect of exchange rate changes on cash and cash equivalents	45	51
Net increase in cash and cash equivalents	1,031,616	500,153
Cash and cash equivalents
Beginning balance	893,943	301,493
Ending balance	1,925,559	801,646
Supplemental disclosure of cash flow information:
Cash paid for interest	0	0
Cash paid for income taxes	0	0
Supplemental disclosure of noncash investing and financing activities:
Fair value of common stock and unregistered restricted stock units issued as consideration for business combination	31,274	0
Property and equipment additions in accounts payable and accrued expenses	32,935	23,482
Conversion of convertible preferred stock to common stock upon direct listing	$ 879,113	$ 0