Other Income (Expense), Net - Schedule of Other Income (Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other Income and Expenses [Abstract]
Interest and amortization expense	$ (622)	$ 0	$ (1,239)	$ 0
Sale of New Jersey state tax benefit	0	0	2,898	2,288
Investment and other income, net	117	29	238	52
Other income (expense), net	$ (505)	$ 29	$ 1,897	$ 2,340