Acquisition Related Liabilities - Schedule of Acquisition Related Liabilities (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Schedule of acquisition related liabilities [Line Items]
Balance as of January 1, 2022	$ 22,957
Additions	7,539
Payments made during the period	(2,478)
Change in fair value of earn-out	10,795
Balance as of June 30, 2022	38,813
eBay CRM [Member]
Schedule of acquisition related liabilities [Line Items]
Balance as of January 1, 2022	8,000
Balance as of June 30, 2022	8,000
Sizmek [Member]
Schedule of acquisition related liabilities [Line Items]
Balance as of January 1, 2022	1,927
Additions	241
Payments made during the period	(2,168)
Change in fair value of earn-out	241
IgnitionOne [Member]
Schedule of acquisition related liabilities [Line Items]
Balance as of January 1, 2022	1,360
Balance as of June 30, 2022	1,360
Kinetic Data Solutions, LLC [Member]
Schedule of acquisition related liabilities [Line Items]
Balance as of January 1, 2022	24
Payments made during the period	(205)
Change in fair value of earn-out	791
Balance as of June 30, 2022	610
Vital Digital, Corp [Member]
Schedule of acquisition related liabilities [Line Items]
Balance as of January 1, 2022	2,840
Payments made during the period	(105)
Change in fair value of earn-out	337
Balance as of June 30, 2022	3,072
Apptness Media Group, LLC [Member]
Schedule of acquisition related liabilities [Line Items]
Balance as of January 1, 2022	8,806
Change in fair value of earn-out	8,160
Balance as of June 30, 2022	16,966
ArcaMax [Member]
Schedule of acquisition related liabilities [Line Items]
Additions	7,539
Change in fair value of earn-out	1,266
Balance as of June 30, 2022	$ 8,805