Supplementary Information - Summary of Restructuring Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Restructuring Cost And Reserve [Line Items]
Total restructuring expense	$ 1,732	$ 5,078
Maintenance and Other Services [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expense	55	830
Cost of Revenue - Software Related Services [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expense	106	106
Research and Development [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expense	616	1,745
Sales and Marketing [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expense	1,014	1,926
General and Administrative [Member]
Restructuring Cost And Reserve [Line Items]
Total restructuring expense	$ (59)	$ 471