Stockholders' Equity - Summary of Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Unrealized gain (loss) on investments, Beginning balance	$ (1,113)	$ 0	$ (10)
Unrealized gain (loss) on investments, Other comprehensive income (loss)	1,103	(1,113)	10
Unrealized gain (loss) on investments, Ending balance	(10)	(1,113)	0
Foreign currency translation adjustment, Beginning balance	0	0	0
Foreign currency translation adjustment, Other comprehensive income (loss)	(517)	0	0
Foreign currency translation adjustment, Ending balance	(517)	0	0
Unrealized gain (loss) on derivative instrument, Beginning balance	0	0	(266)
Unrealized gain (loss) on derivative instrument, Other comprehensive income (loss)	0	0	266
Unrealized gain (loss) on derivative instrument, Ending balance	0	0	0
Other comprehensive income (loss)	586	(1,113)	276
Accumulated other comprehensive income	$ (527)	$ (1,113)	$ 0	$ (276)