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Major Customers, Partnerships and Strategic Alliances - CHDI Foundation, Inc. - Additional Information (Detail) (CHDI Foundation, Inc. [Member], USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Apr. 30, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CHDI Foundation, Inc. [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Funds due under agreement	$ 1.3
Agreement date		Apr. 30, 2011
Agreement to receive	1 year
Contractual agreement termination date		Aug. 31, 2012
Funds due under agreement as per amendment			1.3	2.1
Collaboration agreement related costs and expenses		0	0	1.1
Revenues under the agreement		$ 0	$ 0	$ 1.1