Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Tax Benefit from Stock Options Exercised	$ 0	$ 0	$ (7)
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	2,624	3,394
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0	140	117
Deferred Tax Assets, Valuation Allowance	13,179	7,832	$ 2,006	$ 1,833
Fully Vested Options Expired Unexercised
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	0	908
Restricted Stock
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	0	$ 421
United States
Deferred Tax Assets, Valuation Allowance	1,268
United States
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	8,981
ITALY
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	4,209
Deferred Tax Assets, Valuation Allowance	$ 1,158