CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities
Net loss	$ (221,121)	$ (161,789)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	28,729	27,953
Share-based compensation	217,256	168,601
Amortization of deferred costs	65,024	48,739
Amortization of debt discount and issuance costs	3,673	38,085
Real estate impairments	28,363	0
Allowance for credit losses on accounts receivable	6,641	6,199
Other, net	4,713	1,241
Changes in operating assets and liabilities:
Accounts receivable	45,516	3,733
Prepaid expenses and other current assets	(6,970)	(9,385)
Deferred costs	(80,759)	(75,846)
Lease right-of-use assets	12,085	12,876
Other assets and liabilities	(1,223)	(3,888)
Accounts payable	(5,769)	18,304
Accrued liabilities	16,319	1,349
Accrued compensation and related benefits	(24,767)	16,059
Deferred revenue	18,816	64,710
Lease liabilities	(16,351)	(22,658)
Net cash provided by operating activities	90,175	134,283
Cash flows from investing activities
Purchases of property and equipment	(15,014)	(11,030)
Internal-use software development costs	(8,230)	(10,837)
Purchases of marketable securities	(398,519)	(718,636)
Proceeds from maturities of marketable securities	365,275	590,588
Proceeds from sales of marketable securities	155,020	101,995
Business combinations, net of cash acquired	0	(7,811)
Purchases of strategic investments	(1,500)	(1,000)
Proceeds from sales of strategic investments	0	1,008
Net cash provided by (used in) investing activities	97,032	(55,723)
Cash flows from financing activities
Proceeds from exercises of employee stock options	15,504	18,889
Proceeds from employee stock purchase plan	34,685	37,136
Taxes paid related to net share settlement of share-based awards	(5,509)	(8,940)
Net cash provided by financing activities	44,680	47,085
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(41)	(33)
Net increase in cash, cash equivalents and restricted cash	231,846	125,612
Cash, cash equivalents and restricted cash at beginning of period	477,350	407,859
Cash, cash equivalents and restricted cash at end of period	709,196	533,471
Reconciliation of cash, cash equivalents and restricted cash to condensed consolidated balance sheets
Cash and cash equivalents	707,047	532,517
Restricted cash included in prepaid expenses and other current assets	2,149	949
Restricted cash included in other assets	0	5
Total cash, cash equivalents and restricted cash	709,196	533,471
Supplemental cash flow data
Cash paid for interest	3,967	3,967
Cash paid for taxes	8,744	7,940
Non-cash investing and financing activities
Balance of property and equipment in accounts payable and accrued expenses	2,633	1,069
Property and equipment acquired through tenant improvement allowances	1,208	429
Internal-use software development costs
Non-cash investing and financing activities
Share-based compensation capitalized in internal-use software development costs and in deferred costs	1,203	1,317
Deferred costs
Non-cash investing and financing activities
Share-based compensation capitalized in internal-use software development costs and in deferred costs	$ 1,782	$ 2,013