Other Income (Expense), Net - Schedule of Other Income (Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other Income and Expenses [Abstract]
Interest and amortization expense	$ (629)	$ 0	$ (1,868)	$ 0
Sale of New Jersey state tax benefit	0	0	2,898	2,288
Investment and other income, net	106	27	344	79
Other income (expense), net	$ (523)	$ 27	$ 1,374	$ 2,367