Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Valuation allowance	$ (4,730)	$ (8,965)
Unrecognized tax benefit	3,658	3,497
Reduction in income tax expense resulting from recognition of unrecognized tax benefit	$ 2,000
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Income tax examination description	Our U.S. federal tax returns for 2012 and subsequent years remain open to full examination. Our California and Massachusetts tax returns for 2011 and subsequent tax years remain open to full examination.
Federal
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 10,000	16,000
Federal and state net operating loss carryforwards subject to limitations	5,000
State and Local Jurisdiction
Income Taxes [Line Items]
Operating Loss Carryforwards	2,000	6,000
Federal and state net operating loss carryforwards subject to limitations	0
Foreign Tax Authority
Income Taxes [Line Items]
Operating Loss Carryforwards	4,000	13,000
Unrecognized Tax Benefits Before Interest And Penalties
Income Taxes [Line Items]
Unrecognized tax benefit	$ 3,357	$ 3,397