Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities:
Net loss	$ (77,837)	$ (85,031)	$ (53,746)
Adjustments to reconcile net loss to net cash and cash equivalents provided by operating activities:
Depreciation and amortization	45,159	37,060	28,793
Stock-based compensation	166,761	121,488	97,754
Loss on early extinguishment of 2022 Convertible Notes	4,892	10,507
Repayment of 2022 Convertible Notes attributable to the debt discount	(26,428)	(49,048)
Gain on termination of operating leases	(4,276)
Loss on disposal of fixed assets	6,468
Gain on strategic investments	(11,741)
Benefit from deferred income taxes	(2,869)	(2,185)	(799)
Amortization of debt discount and issuance costs	23,507	24,890	21,790
Amortization (accretion) of bond discount	4,275	(3,657)	(14,160)
Unrealized currency translation	1,304	(952)	(156)
Changes in assets and liabilities, net of acquisition
Accounts receivable	(34,107)	(29,971)	(15,428)
Prepaid expenses and other assets	(1,077)	(17,026)	(3,296)
Deferred commission expense	(32,560)	(19,288)	(9,666)
Right-of-use assets	31,418	31,406	22,657
Accounts payable	(10,608)	3,697	3,927
Accrued expenses and other current liabilities	58,209	26,020	7,819
Operating lease liabilities	(29,478)	(31,621)	(15,781)
Deferred revenue	127,716	72,624	49,265
Net cash and cash equivalents provided by operating activities	238,728	88,913	118,973
Investing Activities:
Purchases of investments	(1,484,762)	(1,517,357)	(1,304,847)
Maturities of investments	1,387,498	1,352,231	1,066,366
Sale of investments		10,932
Purchases of property and equipment	(28,726)	(37,274)	(40,372)
Capitalization of software development costs	(33,139)	(21,599)	(13,474)
Acquisition of a business, net of cash acquired	(16,810)		(23,314)
Proceeds from sale of strategic investments	12,620
Equity method investment	(3,100)
Purchase of strategic investments	(13,089)	(2,500)	(553)
Net cash and cash equivalents used in investing activities	(179,508)	(215,567)	(316,194)
Financing Activities:
Proceeds from issuance of 2025 Convertible Notes, net of issuance costs paid of $9.9 million		450,123
Proceeds from settlement of Convertible Note Hedges related to the 2022 Convertible Notes	8,985	363,554
Payments for settlement of Warrants related to the 2022 Convertible Notes		(327,543)
Repayment of 2022 Convertible Notes attributable to the principal	(89,525)	(235,993)
Payments for Capped Call Options related to the 2025 Convertible Notes		(50,600)
Proceeds from common stock offering, net of offering costs paid of $365			342,628
Repayment of debt			(333)
Employee taxes paid related to the net share settlement of stock-based awards	(17,439)	(7,424)	(6,247)
Proceeds related to the issuance of common stock under stock plans	46,510	30,371	23,578
Repayment of finance lease obligations		(28)	(284)
Net cash and cash equivalents (used) provided by financing activities	(51,469)	222,460	359,342
Effect on exchange rate changes on cash and cash equivalents	(8,861)	6,831	(720)
Net increase in cash, cash equivalents and restricted cash	(1,110)	102,637	161,401
Cash, cash equivalents and restricted cash, beginning of year	381,152	278,515	117,114
Cash, cash equivalents and restricted cash, end of year	380,042	381,152	278,515
Supplemental cash flow disclosure:
Cash paid for interest	1,843	1,512	1,014
Cash paid for income taxes	6,970	2,306	3,090
Right-of-use assets obtained in exchange for operating lease facilities	92,131	65,340	105,496
Right-of-use asset reductions related to operating lease terminations	(46,587)
Non-cash investing and financing activities:
Capital expenditures incurred but not yet paid	470	1,038	4,606
Asset retirement obligations	71	773	$ 2,014
Issuance of common stock for repayment of 2022 Convertible Notes	$ 493,172	$ 336,289