Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Less valuation allowance	$ 70,478,000	$ 62,646,000
Liabilities for unrecognized tax benefits	3,100,000	2,800,000
Amount of unrecognized tax benefits, which, if recognized, would affect the tax rate	100,000	100,000
Penalties accrued related to unrecognized tax benefits	400	51,000
Interest accrued related to unrecognized tax benefits	3,000	7,000
Recognized total liability for penalties	15,000	15,000
Recognized total liability for interest	24,000	$ 21,000
Federal
Income Taxes [Line Items]
Operating loss carryforwards	89,700,000
State
Income Taxes [Line Items]
Operating loss carryforwards	17,600,000
Foreign
Income Taxes [Line Items]
Operating loss carryforwards	$ 117,500,000