Contractual Obligations and Commitments (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Feb. 20, 2013 Payment Upon First Commercial Sale Of Sts [Member]	Sep. 26, 2002 Payment Up On Completion Of Phase Iii Clinical Trial [Member]
Expected Future Contract Payments	$ 0.1	$ 0.5