Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Net operating loss carryforwards	$ 69,307	$ 65,601
Accruals and reserves	34,021	30,322
Software revenue	6,559	6,608
Depreciation	3,593	5,327
Tax credit carryforwards	8,094	6,686
Other	19	58
Total deferred tax assets	121,593	114,602
Less valuation allowances	(34,054)	(35,509)
Total net deferred tax assets	87,539	79,093
Intangibles	(17,641)	(13,363)
Total deferred tax liabilities	(17,641)	(13,363)
Total net deferred income taxes	$ 69,898	$ 65,730