Supplementary Information - Summary of Restructuring Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Restructuring Cost And Reserve [Line Items]
Total restructuring expense	$ (124)	$ 4,954
Maintenance and Other Services [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expense	36	866
Cost of Revenue - Software Related Services [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expense	(46)	60
Research and Development [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expense	(24)	1,721
Sales and Marketing [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expense	$ (90)	1,836
General and Administrative [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expense		$ 471