CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
OPERATING ACTIVITIES:
Net loss	$ (75,121,000)	$ (94,338,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock-based compensation expense	47,967,000	46,171,000
Depreciation	20,471,000	17,223,000
Non-cash restructuring costs	0	19,085,000
Amortization of purchased intangibles and finance leases	4,939,000	2,073,000
Amortization of debt issuance costs	1,858,000	908,000
Accretion of debt discount on convertible senior notes	24,770,000	7,227,000
Changes in fair value of contingent consideration	0	(263,000)
Allowance for credit losses	2,431,000	2,627,000
Gain on settlement of leases	(3,483,000)	0
Deferred income taxes	(1,129,000)	47,000
Changes in operating assets and liabilities:
Accounts receivable	(5,827,000)	19,231,000
Prepaid expenses and other current assets	(10,269,000)	(6,055,000)
Contract acquisition costs noncurrent	(4,765,000)	(8,156,000)
Other assets	741,000	(35,000)
Accounts payable	(354,000)	(4,572,000)
Accrued expenses and other current liabilities	22,176,000	36,904,000
Deferred revenue	14,925,000	(164,000)
Operating lease liabilities	(4,018,000)	(287,000)
Other liabilities	330,000	29,000
Net cash provided by operating activities	35,642,000	37,655,000
INVESTING ACTIVITIES:
Purchases of property and equipment, including capitalized software	(33,821,000)	(32,904,000)
Payments for acquisition, net of cash acquired	(23,014,000)	0
Repayment of debt acquired in acquisition	(1,955,000)	0
Payments for intangible assets	(1,931,000)	(1,259,000)
Net cash used in investing activities	(60,721,000)	(34,163,000)
FINANCING ACTIVITIES:
Principal payments for financing leases	(2,604,000)	0
Proceeds from issuance of common stock in connection with the exercise of options and ESPP	13,127,000	17,147,000
Payments on conversion of convertible senior notes	(2,000)	0
Net cash provided by financing activities	10,521,000	17,147,000
Effect of foreign exchange rate changes on cash and cash equivalents	(5,072,000)	1,532,000
Net increase (decrease) in cash, cash equivalents, and restricted cash	(19,630,000)	22,171,000
Cash, cash equivalents, and restricted cash - beginning of year	654,152,000	176,523,000
Cash, cash equivalents, and restricted cash - end of year	634,522,000	198,694,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	633,042,000	198,694,000
Restricted cash in prepaid expenses and other current assets	1,480,000	0
Total cash, cash equivalents, and restricted cash	634,522,000	198,694,000
Supplemental disclosure of other cash flow information:
Cash paid for income taxes	2,219,000	4,321,000
Cash paid for interest	1,981,000	1,843,000
Supplemental disclosure of non-cash investing and financing activities:
Purchase of property and equipment recorded in accounts payable	581,000	$ 1,273,000
Issuance of 11,508 shares of common stock as earnout payment in connection with AdvantageTec Inc. (shares)		11,508
Issuance of 11,508 shares of common stock as earn-out payment in connection with AdvantageTec Inc.	0	$ 294,000
Issuance of shares of common stock to settle cash awards	33,503,000	24,656,000
Right of use assets obtained in exchange for operating lease liabilities	$ 1,856,000	0
Issuance of 351,462 shares of common stock in connection with the ebot-7 transaction on July 14, 2021 (shares)	351,462
Issuance of 351,462 shares of common stock	$ 20,012,000	0
Fair value of contingent earn-out recorded in other long-term liabilities	$ 6,026,000	$ 0