Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net loss	$ (91,918)	$ (74,978)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	8,271	7,319
Stock-based compensation	71,669	49,184
Amortization of deferred commissions	11,511	9,552
Noncash operating lease costs	6,201	7,226
Amortization of debt discount and issuance costs	5,124	2,427
Changes in assets and liabilities:
Trade receivables	22,847	14,939
Prepaid expenses and other current assets	568	(1,862)
Deferred commissions	(13,652)	(13,172)
Other long-term assets	819	(250)
Trade payables	2,596	(379)
Accrued expenses and other short-term liabilities	(5,057)	(1,267)
Deferred revenues	(13,241)	(16,943)
Other long-term liabilities	1,102	4,708
Net cash provided by (used in) operating activities	6,840	(13,496)
Cash flows from investing activities:
Proceeds from sales and maturities of marketable securities	26,106	41,482
Investment in marketable securities	0	(34,063)
Proceeds from short-term and long-term deposits	80,236	35,025
Investment in short-term and long-term deposits	(50,000)	(85,000)
Purchases of property and equipment	(4,120)	(7,001)
Net cash provided by (used in) investing activities	52,222	(49,557)
Cash flows from financing activities:
Proceeds from employee stock plans, net	9,956	9,622
Proceeds from follow-on offering, net	500,034	0
Proceeds from issuance of convertible senior notes, net of issuance costs	0	245,308
Purchases of capped calls	0	(29,348)
Net cash provided by financing activities	509,990	225,582
Increase in cash and cash equivalents	569,052	162,529
Cash and cash equivalents at beginning of period	234,092	68,929
Cash and cash equivalents at end of period	803,144	231,458
Supplemental disclosure of cash flow information:
Cash paid for income taxes	3,646	1,308
Net lease liabilities arising from obtaining right-of-use assets	$ 22,098	$ 0