Merger, Acquisition, and Restructuring Costs (Tables)

12 Months Ended

Dec. 31, 2021

Restructuring and Related Activities [Abstract]

Schedule of Restructuring and Other Exit Costs

The following table summarizes merger, acquisition, and restructuring cost activity (in thousands):

	Year Ended
	December 31, 2021		December 31, 2020		December 31, 2019
	(in thousands)
Professional Service (investment banking advisory, legal and other professional services)	$	28,422	$	9,935	$	2,041
Personnel related (severance and one-time termination benefit costs)	6,184		5,747		—
Non-cash stock-based compensation (double-trigger acceleration and severance)	1,071		1,870		—
Loss contracts (lease related)	2,500		—		—
Total merger, acquisition, and restructuring costs	$	38,177	$	17,552	$	2,041

Accrued restructuring costs related to mergers and acquisitions were $2.7 million and $2.9 million at December 31, 2021 and December 31, 2020, respectively and were primarily related to the SpotX Acquisition, the SpringServe Acquisition, and the Telaria Merger. Accrued restructuring costs associated with personnel costs are included within accounts payable and accrued expenses and accruals related to assumed loss contracts are included within other current liabilities and other liabilities, non-current on the Company's consolidated balance sheets.

	Year Ended
	December 31, 2021		December 31, 2020		December 31, 2019
	(in thousands)
Accrued merger. acquisition, and restructuring costs at beginning of period	$	2,935	$	—	$	67
Restructuring costs (personnel related and non-cash stock-based compensation)	7,255		7,617		—
Restructuring activity, merger and acquisition loss contracts	2,500		3,543		—
Cash paid for restructuring costs	(6,377)		(6,355)		(67)
Non-cash loss contracts (lease related)	(2,500)		—		—
Non-cash stock-based compensation	(1,071)		(1,870)		—
Accrued merger, acquisition, and restructuring costs at end of period	$	2,742	$	2,935	$	—