Other Income (Expense), Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income and Expenses [Abstract]
Interest and amortization expense	$ (2,493)	$ (628)	$ (3,795)
Sale of New Jersey state tax benefit	2,898	2,288	1,268
Investment and other income, net	457	179	3
Expense due to change in fair value measurements	0	0	(3,717)
Loss on conversion of notes payable to related parties	0	0	(2,737)
Other income (expense), net	$ 862	$ 1,839	$ (8,978)