Commitments and Contingencies - Additional Information (Detail) $ in Millions		12 Months Ended
	Nov. 30, 2013 Lawsuit	Dec. 31, 2015 USD ($) ft² Renewal_Options	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Area for leasing facility of manufacturing, research laboratory and office space | ft²		68,400
Expiry date of lease		Aug. 01, 2017
Number of additional renewals for lease beyond its expiration | Renewal_Options		3
Renewal period for lease for lease beyond its expiration		5 years
Base rent paid and the rent expensed recorded as deferred rent in balance sheet		$ 0.9
Rent expense		$ 2.8	$ 2.8	$ 2.8
Number of putative, securities class action complaints filed in U.S District Court | Lawsuit	2