Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Valuation allowance, deferred tax asset, change in amount	$ 16,000,000
Unremitted foreign earnings	0
Unrecognized tax benefits	1,048,000	$ 862,000	$ 606,000
Accrued interest or penalties related to uncertain tax positions	$ 0	$ 0
Statutory income tax rate	34.00%	34.00%	34.00%
Domestic Tax Authority [Member]
Income Tax Contingency [Line Items]
Operating loss carry forwards	$ 221,500,000
Excess tax benefits related to deductions from the exercise of stock options	400,000
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Operating loss carry forwards	176,500,000
Excess tax benefits related to deductions from the exercise of stock options	$ 400,000
Foreign Tax Authority [Member]
Income Tax Contingency [Line Items]
Operating loss carry forwards expiration period	2023
Foreign Tax Authority [Member] | Italy
Income Tax Contingency [Line Items]
Operating loss carry forwards	$ 10,000,000
Foreign Tax Authority [Member] | Luxembourg [Member]
Income Tax Contingency [Line Items]
Operating loss carry forwards	100,000
Foreign Tax Authority [Member] | Switzerland [Member]
Income Tax Contingency [Line Items]
Operating loss carry forwards	$ 4,300,000
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
Research Tax Credit Carryforward [Member]
Income Tax Contingency [Line Items]
Tax credit carry forward, amount	$ 5,000,000
Tax credit carry forward expiration period	2027