Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (21,789)	$ (25,385)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	10,843	6,656
Amortization of deferred costs	3,722	2,922
Deferred income taxes	(6,701)	(1,246)
Accretion of interest on debt	6,313	5,436
Loss on extinguishment of convertible notes and capped call modification	2,888
Provision for credit losses and sales reserve	1,562	925
Stock-based compensation	12,685	10,310
Other non-cash adjustments	(147)
Changes in operating assets and liabilities:
Accounts receivable	11,482	445
Prepaid expenses	(1,221)	(3,057)
Deferred costs	(3,450)	(4,720)
Other assets	(2,768)	(4,069)
Accounts payable	(911)	(1,072)
Accrued payroll and employee related liabilities	(2,130)	3,221
Accrued expenses	3,012	1,732
Deferred revenue	8,373	5,118
Other liabilities	(1,955)	3,585
Net cash provided by operating activities	19,808	801
Cash flows from investing activities:
Capital expenditures	(1,812)	(524)
Payments for acquisition of business, net of acquired cash	(32,401)	(34,941)
Additions to capitalized software development costs	(2,495)	(2,004)
Net cash used in investing activities	(36,708)	(37,469)
Cash flows from financing activities:
Proceeds from issuance of convertible notes	375,000
Payments of debt issuance costs	(9,562)	(131)
Purchase of convertible notes capped call hedge	(35,100)
Repurchase of convertible notes	(58,641)
Proceeds from termination of convertible notes capped call hedge	10,650
Restricted stock units withheld to settle employee tax withholding liability	(1,610)	(400)
Proceeds from employee stock purchase plan	2,451	1,710
Proceeds from stock option exercises	1,604	2,989
Net cash provided by financing activities	284,792	4,168
Effect of exchange rates on cash, cash equivalents and restricted cash	(315)	(666)
Net increase (decrease) in cash, cash equivalents and restricted cash	267,577	(33,166)
Cash, cash equivalents and restricted cash—beginning of period	475,630	539,662
Cash, cash equivalents and restricted cash—end of period	743,207	506,496
Supplemental disclosures of cash flow information:
Interest	318	184
Taxes, net of refunds received	674
Supplemental disclosure of non-cash activities:
Common stock issued in connection with acquisitions	23,032	30,434
Contingent consideration in connection with acquisitions	9,135	2,530
Common stock issued in connection with settlement of convertible notes	15,650
Debt issuance costs included in accrued expenses	1,078
Stock-based compensation capitalized for software development costs	85	58
Other non-cash activities	$ 100	$ 703