Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES:
Net loss	$ (225,747)	$ (124,974)	$ (107,594)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Stock-based compensation expense	109,638	69,656	65,946
Depreciation	32,284	27,423	22,826
Loss on disposal	0	0	5,147
Amortization of purchased intangible assets and finance leases	22,112	9,327	3,552
Amortization of debt issuance costs	3,778	2,499	1,340
Accretion of debt discount on convertible senior notes	0	33,309	11,564
Change in fair value of contingent consideration	(8,516)	0	(263)
Allowance for credit losses	5,644	4,879	3,211
Gain on settlement of leases	(242)	(3,483)	0
Deferred income taxes	(1,161)	(6,239)	579
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(38)	(17,309)	6,371
Prepaid expenses and other current assets	(5,979)	(3,178)	23
Contract acquisition costs noncurrent	(6,370)	(1,876)	(6,463)
Other assets	(153)	547	(37)
Accounts payable	12,050	801	(733)
Accrued expenses and other current liabilities	7,485	8,626	22,931
Deferred revenue	(12,341)	7,774	(3,118)
Operating lease liabilities	(2,638)	(4,590)	8,276
Other liabilities	8,093	55	47
Net cash (used in) provided by operating activities	(62,101)	3,247	33,605
INVESTING ACTIVITIES:
Purchases of property and equipment, including capitalized software	(48,486)	(45,703)	(41,641)
Payments for acquisitions, net of cash acquired	(3,430)	(70,759)	0
Purchases of intangible assets	(2,680)	(2,610)	(1,835)
Repayment of debt acquired in acquisition	0	(21,177)	0
Investment in joint venture	(2,264)	0	0
Net cash used in investing activities	(56,860)	(140,249)	(43,476)
FINANCING ACTIVITIES:
Principal payments for financing leases	(3,734)	(3,554)	(1,154)
Repurchase of common stock	(221)	(709)	0
Proceeds from issuance of common stock in connection with the exercise of options and ESPP	5,573	16,110	25,355
Proceeds from issuance of convertible senior notes	0	(4)	517,500
Payment of issuance costs in connection with convertible senior notes	0	0	(11,800)
Purchase of capped call option	0	0	(46,058)
Net cash provided by financing activities	1,618	11,843	483,843
Effect of foreign exchange rate changes on cash and cash equivalents	(3,981)	(5,461)	3,657
Net (decrease) increase in cash, cash equivalents, and restricted cash including cash classified within current assets held for sale	(121,324)	(130,620)	477,629
Less: cash classified within current assets held for sale	(10,011)	0	0
Cash, cash equivalents, and restricted cash - beginning of year	523,532	654,152	176,523
Cash, cash equivalents, and restricted cash - end of year	392,197	523,532	654,152
Reconciliation of cash, cash equivalents, and restricted cash to consolidated balance sheets:
Cash and cash equivalents	391,781	521,846	654,152
Restricted cash in prepaid expenses and other current assets	416	1,686	0
Total cash, cash equivalents, and restricted cash	392,197	523,532	654,152
Supplemental disclosure of other cash flow information:
Cash paid for income taxes	3,237	582	4,651
Cash paid for interest	1,932	2,090	1,931
Non-cash investing and financing activities:
Increase in convertible senior notes, net upon adoption of ASU 2020-06 (Note 1)	(159,407)	0	0
Purchase of property and equipment in accounts payable	1,022	470	1,638
Right-of-use assets obtained in exchange for operating lease liabilities	0	2,125	0
Right-of-use assets obtained in exchange for finance lease liabilities	0	0	10,818
Issuance of common shares as earn-out payment associated with business acquisitions			293
Issuance of shares of common stock to settle cash awards	17,300	33,503	24,657
AdvantageTec
Non-cash investing and financing activities:
Issuance of common shares as earn-out payment associated with business acquisitions	$ 0	$ 0	$ 293
e-bot7
Non-cash investing and financing activities:
Issuance of shares of common stock in connection with acquisition (in shares)	351,462	351,462	351,462
Stock Issued	$ 0	$ 20,012	$ 0
Noncash Or Part Noncash Acquisition, Contingent Liability	7,362,000	$ 6,170	0
Tenfold
Non-cash investing and financing activities:
Issuance of shares of common stock in connection with acquisition (in shares)		698,219
Stock Issued	0	$ 41,224	0
Noncash Or Part Noncash Acquisition, Contingent Liability	6,558,000	$ 6,946	0
VoiceBase
Non-cash investing and financing activities:
Issuance of shares of common stock in connection with acquisition (in shares)		1,080,532
Stock Issued		$ 67,557	0
Noncash Or Part Noncash Acquisition, Contingent Liability	$ 16,067,000	16,714	0
WildHealth
Non-cash investing and financing activities:
Issuance of shares of common stock in connection with acquisition (in shares)	776,825,000
Stock Issued	$ 17,675	0	0
Noncash Or Part Noncash Acquisition, Contingent Liability	$ 42,234,000	$ 0	$ 0