CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (80,701)	$ (108,978)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	20,586	13,346
Amortization of intangible assets	10,618	10,620
Amortization of right-of-use assets and other	13,378	12,660
Amortization of debt discount and issuance costs	1,739	1,269
Amortization of deferred contract costs	3,989	2,946
Stock-based compensation	75,000	64,264
Provision for credit losses	529	(195)
Interest on finance lease	(1,240)	(735)
Loss on disposals of property and equipment	854	27
Amortization and accretion of discounts and premiums on investments	1,851	0
Net gain on extinguishment of debt	(54,391)	0
Other adjustments	61	813
Changes in operating assets and liabilities:
Accounts receivable	(4,122)	(5,612)
Prepaid expenses and other current assets	(4,812)	(5,494)
Other assets	(6,399)	(5,089)
Accounts payable	844	162
Accrued expenses	1,162	(3,835)
Operating lease liabilities	(12,837)	(12,856)
Other liabilities	4,021	8,804
Net cash used in operating activities	(29,870)	(27,883)
Cash flows from investing activities:
Purchases of marketable securities	(355,479)	(333,868)
Sales of marketable securities	161,853	12,497
Maturities of marketable securities	367,880	57,253
Business acquisitions, net of cash acquired and other related payments	(25,999)	0
Advance payment for purchase of property and equipment	(29,310)	0
Purchases of property and equipment	(8,815)	(11,013)
Proceeds from sale of property and equipment	241	0
Capitalized internal-use software	(8,736)	(2,680)
Purchase of intangible assets	0	(2,093)
Net cash provided by (used in) investing activities	101,635	(279,904)
Cash flows from financing activities:
Issuance of convertible note, net of issuance costs	0	930,775
Payments of other debt issuance costs	0	(1,351)
Net cash paid for debt extinguishment	(177,082)	0
Repayments of finance lease liabilities	(11,029)	(6,579)
Cash received for restricted stock sold in advance of vesting conditions	10,655	0
Cash paid for early sale of restricted shares	(7,037)	0
Proceeds from exercise of vested stock options	4,769	5,605
Proceeds from employee stock purchase plan	3,977	4,564
Net cash provided by (used in) financing activities	(175,747)	933,014
Effects of exchange rate changes on cash, cash equivalents, and restricted cash	(319)	(141)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(104,301)	625,086
Cash, cash equivalents, and restricted cash at beginning of period	166,961	63,880
Cash, cash equivalents, and restricted cash at end of period	62,660	688,966
Supplemental disclosure of cash flow information:
Cash paid for interest	1,304	759
Cash paid for income taxes, net of refunds received	180	175
Property and equipment additions not yet paid in cash	3,636	1,814
Stock-based compensation capitalized to internal-use software	3,522	754
Assets obtained in exchange for operating lease obligations	15,676	13,481
Assets obtained in exchange for finance lease obligations	22,178	15,538
Net non-cash change in operating lease assets and liabilities associated with modifications and terminations	2,960	0
Purchase consideration associated with business combination, accrued but not paid	8,126	0
Costs associated with business combination, accrued but not paid	1,873	0
Reconciliation of cash, cash equivalents, and restricted cash as shown in the statements of cash flows:
Cash and cash equivalents	62,510	687,986
Restricted cash, current	150	87
Restricted cash, non-current	0	893
Total cash, cash equivalents, and restricted cash	$ 62,660	$ 688,966