CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net loss	$ (81,169)	$ (28,350)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	53,563	26,060
Share-based compensation	137,410	71,690
Amortization of deferred and prepaid sales commission costs	33,060	21,189
Amortization of debt discount and issuance costs	32,613	15,149
Loss on early extinguishment of debt	12,323	0
Repayment of convertible senior notes attributable to debt discount	(32,640)	0
Reduction of operating lease right-of-use assets	11,478	10,166
Unrealized gain and other related costs on investments	(41,453)	0
Foreign currency remeasurement (gain) loss	63	61
Provision for bad debt	3,909	2,339
Deferred income taxes	(267)	(632)
Tax benefit from release of valuation allowance	0	(3,210)
Other	203	1,925
Changes in assets and liabilities:
Accounts receivable	(27,502)	(24,845)
Deferred and prepaid sales commission costs	(183,745)	(51,467)
Prepaid expenses and other current assets	(14,613)	(8,125)
Other assets	322	400
Accounts payable	5,180	10,626
Accrued liabilities	41,530	22,432
Deferred revenue	20,128	16,632
Operating lease liabilities	(11,019)	(10,507)
Other liabilities	7,919	(525)
Net cash (used in) provided by operating activities	(32,707)	71,008
Cash flows from investing activities
Purchases of property and equipment	(33,992)	(21,355)
Capitalized internal-use software	(28,049)	(11,472)
Cash paid for business combination, net of cash acquired	0	(27,870)
Net cash used in investing activities	(62,041)	(60,697)
Cash flows from financing activities
Proceeds from issuance of convertible senior notes, net of issuance costs	1,627,209	0
Payments for 2023 convertible senior notes partial repurchase	(1,019,813)	0
Payments for capped calls and transaction costs	(102,695)	0
Proceeds from issuance of stock in connection with stock plans	24,123	17,590
Payments for taxes related to net share settlement of equity awards	(27,698)	(10,244)
Payment for contingent consideration for business acquisition	(3,548)	0
Repayment of financing obligations	(1,215)	(943)
Net cash provided by financing activities	496,363	6,403
Effect of exchange rate changes	337	(380)
Net increase (decrease) in cash, cash equivalents and restricted cash	401,952	16,334
Cash, cash equivalents and restricted cash
Beginning of period	343,606	566,329
End of period	745,558	582,663
Supplemental disclosure of cash flow data
Cash paid for interest	190	189
Cash paid for income taxes, net of refunds	512	718
Non-cash investing and financing activities
Cash held for future indemnity claims and other potential future payments	0	7,148
Equipment and capitalized internal-use software purchased and unpaid at period end	$ 7,879	$ 4,861