Includes a) nonrecurring costs from the acquisition of Datawatch of $10.4 million for the three and twelve months ended December 31, 2018, b) a gain on the sale of a building of $4.4 million for the twelve months ended December 31, 2018, b) impairment charges for royalty contracts and trade names resulting in $0.2 million and $2.8 million of expense for the three and twelve months ended December 31, 2018, respectively, and c) a non-recurring adjustment for a change in estimated legal expenses resulting in $2.0 million of income for the twelve months ended December 31, 2018.
(2) Represents revenue not recognized under GAAP due to acquisition accounting adjustments associated with the accounting for deferred revenue in significant business combinations.

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

		(Unaudited)
		Three Months Ended December 31,								Twelve Months Ended December 31,
(in thousands)		2019				2018				2019				2018
Total revenue		$	123,877			$	103,011			$	458,915			$	396,379
Acquisition related deferred revenue (1)			2,250				—				9,000				—
Non-GAAP total revenue		$	126,127			$	103,011			$	467,915			$	396,379

(1) Adjustment for revenue not recognized under GAAP due to acquisition accounting adjustments associated with the accounting for deferred revenue in significant business combinations.