Financial Statement Details - Investment Income, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financial Statement Details [Abstract]
Interest income	$ 312	$ 20	$ 2
Investment amortization accretion income (expense), net	(38)
Dividend income	213
Net realized gains on investments	2,501
Investment income, net	$ 2,988	$ 20	$ 2