Restatement of Previously Issued Financial Statements - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Decrease in revenue due to adjustments	$ 10.0	$ 14.0	$ 12.0	$ 6.0
Decrease in remeasurment gains due to adjustments				$ 4.0
Liability for royalty credit earned	$ 5.3