Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Cash flows from operating activities:
Net loss	$ (19,073)	$ (21,789)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	15,434	10,843
Amortization of deferred costs	3,963	3,722
Deferred income taxes	(6,553)	(6,701)
Accretion of interest on convertible senior notes	1,158	6,313
Loss on extinguishment of convertible notes and capped call modification		2,888
Provision for credit losses and sales reserve	213	1,562
Stock-based compensation	6,084	12,685
Other non-cash adjustments	(52)	(147)
Changes in operating assets and liabilities:
Accounts receivable	11,420	11,482
Prepaid expenses	(2,447)	(1,221)
Deferred costs	(6,221)	(3,450)
Other assets	1,819	(2,768)
Accounts payable	(6,124)	(911)
Accrued payroll and employee related liabilities	(1,862)	(2,130)
Accrued expenses	3,246	3,012
Deferred revenue	8,036	8,373
Other liabilities	(1,339)	(1,955)
Net cash provided by operating activities	7,702	19,808
Cash flows from investing activities:
Capital expenditures	(1,847)	(1,812)
Payment for acquisition of business, net of acquired cash	(47)	(32,401)
Additions to capitalized software development costs	(4,330)	(2,495)
Net cash used in investing activities	(6,224)	(36,708)
Cash flows from financing activities:
Proceeds from issuance of convertible notes		375,000
Payments of debt issuance costs		(9,562)
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
Stock award shares withheld to settle employee tax withholding liability	(571)	(1,610)
Proceeds from employee stock purchase plan	1,702	2,451
Proceeds from stock option exercises	17	1,604
Other	(19)
Net cash provided by financing activities	1,129	284,792
Effect of exchange rates on cash, cash equivalents and restricted cash	(356)	(315)
Net increase in cash, cash equivalents and restricted cash	2,251	267,577
Cash, cash equivalents and restricted cash—beginning of period	492,758	475,630	$ 475,630
Cash, cash equivalents and restricted cash—end of period	495,009	743,207	$ 492,758
Supplemental disclosures of cash flow information:
Interest		318
Taxes, net of refunds received	335	674
Supplemental disclosure of non-cash activities:
Common stock issued in connection with acquisition		23,032
Contingent consideration in connection with acquisition		9,135
Common stock issued in connection with settlement of convertible notes		15,650
Debt issuance costs included in accrued expenses		1,078
Capitalized assets included in accounts payable and accrued expenses	1,195	100
Stock-based compensation capitalized for software development costs	$ 230	$ 85