The following table provides a reconciliation of Non-GAAP operating expense to Total operating expense, the most comparable GAAP financial measure:

	(Unaudited)
	Three Months Ended June 30,								Six Months Ended June 30,
(in thousands)	2023				2022				2023				2022
Total operating expense	$	126,633			$	110,401			$	254,746			$	217,868
Stock-based compensation expense		(21,164	)			(19,170	)			(40,573	)			(35,881	)
Amortization		(7,625	)			(6,208	)			(15,439	)			(12,111	)
(Loss) gain on mark-to-market adjustment of contingent consideration		(981	)			5,304				(7,987	)			5,304
Non-GAAP operating expense	$	96,863			$	90,327			$	190,747			$	175,180

The following table provides a reconciliation of Billings to revenue, the most comparable GAAP financial measure:

	(Unaudited)
	Three Months Ended June 30,								Six Months Ended June 30,
(in thousands)	2023				2022				2023				2022
Revenue	$	141,161			$	132,656			$	307,195			$	292,437
Ending deferred revenue		148,547				112,926				148,547				112,926
Beginning deferred revenue		(141,943	)			(118,403	)			(144,460	)			(106,032	)
Deferred revenue acquired		—				(1,756	)			—				(2,572	)
Billings	$	147,765			$	125,423			$	311,282			$	296,759

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