Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (116,861)	$ (94,010)	$ (78,764)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	10,888	10,167	6,321
Stock-based compensation	109,779	68,585	46,139
Amortization of deferred commissions	14,147	13,106	13,630
Noncash operating lease costs	8,232	8,737	9,023
Amortization of debt discount and issuance costs	6,870	4,096	0
Capital loss from sale of fixed assets	0	0	45
Changes in assets and liabilities:
Trade receivables	(22,950)	(19,075)	8,173
Prepaid expenses and other current assets	(506)	(543)	(1,225)
Deferred commissions	(21,151)	(19,131)	(19,132)
Other long-term assets	1,404	1,172	81
Trade payables	4,474	(328)	(1,623)
Accrued expenses and other short-term liabilities	5,850	16,058	(886)
Deferred revenues	5,421	(169)	7,219
Other long-term liabilities	1,581	5,493	316
Net cash provided by (used in) operating activities	7,178	(5,842)	(10,683)
Cash flows from investing activities:
Proceeds from sales and maturities of marketable securities	34,117	51,539	65,359
Investment in marketable securities	0	(44,124)	(67,120)
Proceeds from short-term and long-term deposits	80,752	74,776	147,531
Investment in short-term and long-term deposits	(50,000)	(97,454)	(87,086)
Acquisition, net of cash acquired	0	(29,369)	0
Proceeds from sale of property and equipment	0	0	11
Purchases of property and equipment	(10,490)	(10,116)	(25,392)
Net cash provided by (used in) investing activities	54,379	(54,748)	33,303
Cash flows from financing activities:
Proceeds from follow-on offering, net	500,034	0	0
Proceeds from issuance of convertible senior notes, net of issuance costs	0	245,308	0
Purchases of capped calls	0	(29,348)	0
Proceeds from employee stock plans, net	10,078	9,793
Proceeds from employee stock plans, net			(2,398)
Net cash provided by (used in) financing activities	510,112	225,753	(2,398)
Increase in cash and cash equivalents	571,669	165,163	20,222
Cash and cash equivalents at beginning of period	234,092	68,929	48,707
Cash and cash equivalents at end of period	805,761	234,092	68,929
Supplemental disclosure of cash flow information:
Cash paid for income taxes	8,507	1,342	3,955
Lease liabilities arising from obtaining right-of-use assets	$ 22,156	$ 6,256	$ 10,252