Commitments and Contingencies - Summary of Consideration Assigned to Identifiable Elements (Detail) - USD ($) $ in Thousands		1 Months Ended
	Sep. 05, 2014	Sep. 30, 2014
Gain Contingencies [Line Items]
Litigation settlement amount	$ 108,712	$ 108,700
Interest income [Member]
Gain Contingencies [Line Items]
Litigation settlement amount	4,866
Implied license [Member]
Gain Contingencies [Line Items]
Litigation settlement amount	85,132
Other damages [Member]
Gain Contingencies [Line Items]
Litigation settlement amount	$ 18,714