Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Valuation allowance, deferred tax asset, change in amount	$ 14,900,000
Unremitted foreign earnings	0
Unrecognized tax benefits	$ 862,000	$ 606,000
Statutory income tax rate	34.00%	34.00%	34.00%
Domestic Tax Authority [Member]
Income Tax Contingency [Line Items]
Operating loss carry forwards	$ 178,100,000
Excess tax benefits related to deductions from the exercise of stock options	900,000
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Operating loss carry forwards	133,700,000
Excess tax benefits related to deductions from the exercise of stock options	900,000
Foreign Tax Authority [Member]
Income Tax Contingency [Line Items]
Operating loss carry forwards	2,100,000
Research Tax Credit Carryforward [Member]
Income Tax Contingency [Line Items]
Tax credit carry forward, amount	$ 4,200,000
Tax credit carry forward expiration period	2027
Maximum [Member]
Income Tax Contingency [Line Items]
Operating loss carry forwards expiration period	2027
Minimum [Member]
Income Tax Contingency [Line Items]
Operating loss carry forwards expiration period	2018