Balance Sheet Details - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Balance Sheet Related Disclosures [Abstract]
Deferred cost of revenue	$ 12,600		$ 12,600		$ 2,000
Reclassified amounts out of OCI, net of tax	$ 12	$ 7	$ 42	$ 26