Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Excess tax benefits from share-based compensation	$ (80)	$ 626	$ 140
Tax Credit Carryforward [Line Items]
Operating loss carryforward not expected to be realized under ASC subtopic 740-10	1,300
Tax credit carryforwards	4,234	7,031
Tax credit carryforwards valuation allowance	6,607	7,477
Permanent book to tax difference from goodwill impairment		8,700
Federal research and development tax credit benefits recognized	2,200	2,600	2,400
Unrecognized tax benefits	3,036	$ 2,963	$ 2,803	$ 2,297
Unrecognized tax benefits that would impact effective tax rate	2,000
Federal
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	4,900
State
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	1,700
Tax credit carryforwards	11,100
Tax credit carryforwards valuation allowance	$ 10,100