Licenses and Exclusive Channel Collaboration Agreements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
MU1140 [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Minimum annual amount to Texas A&M	$ 32,467	$ 41,953
License agreement, original date	Jun. 22, 2000
License agreement, first amendment date	Sep. 15, 2000
License agreement, second amendment date	Jul. 10, 2002
License agreement, third amendment date	Sep. 25, 2002
License agreement, fourth amendment date	Mar. 17, 2003
License agreement, fifth amendment date	Apr. 19, 2013
Patents license expiration period	2017 through 2019
Smart Replacement Therapy [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Minimum annual amount to Texas A&M	10,000	49,575
License agreement, original date	Aug. 04, 1998
License agreement, first amendment date	Sep. 15, 2000
License agreement, second amendment date	Jul. 10, 2002
License agreement, third amendment date	Sep. 25, 2002
License agreement, fourth amendment date	Mar. 17, 2003
License agreement, fifth amendment date	Apr. 19, 2013
Shares issued as partial consideration	29,997
Patent right filling date	Jun. 07, 1995
Patent effective date	Mar. 04, 1997
Patent right expire date	Jun. 07, 2015
Texas A and M University [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Minimum annual amount to Texas A&M	$ 0	$ 0
Number of patent application filed	2