Income Taxes - Narrative (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Contingency [Line Items]
Pretax income (loss)	$ 11,610,000	$ 10,141,000	$ 32,707,000	$ 20,427,000
Income tax provision	3,551,000	$ 3,614,000	14,762,000	$ 8,775,000
Decrease in valuation allowance			2,600,000
Gross unrecognized tax benefits	43,000,000		43,000,000		$ 46,300,000
Unrecognized tax benefits that would impact effective tax rate	38,200,000		38,200,000
Minimum
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits balance may decrease within the next twelve months	0		0
Maximum
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits balance may decrease within the next twelve months	1,800,000		1,800,000
United States - Federal
Income Tax Contingency [Line Items]
Income tax provision			0
Pretax income (loss)	$ 19,600,000		19,600,000
Foreign Tax Authority | Germany and United Kingdom
Income Tax Contingency [Line Items]
Income tax provision			$ 2,000,000