Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 58,823	$ 84,678
Accumulated Amortization	(37,771)	(54,591)
Net Carrying Amount	21,052	30,087
Customer Relationships
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,800	28,000
Accumulated Amortization	(750)	(26,757)
Net Carrying Amount	1,050	1,243
Developed Technology
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	55,772	55,772
Accumulated Amortization	(36,613)	(27,515)
Net Carrying Amount	19,159	28,257
Internal Use Software
Acquired Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,251	906
Accumulated Amortization	(408)	(319)
Net Carrying Amount	$ 843	$ 587