Share Based Payments Summary of Stock Options Outstanding and Activity (Detail) - May. 31, 2015 - USD ($) $ / shares in Units, $ in Thousands		Total
Options
Outstanding, beginning of period		5,724,446
Granted		1,452,500
Exercised	[1]	77,500
Forfeited		35,000
Expired		69,463
Outstanding, end of period		6,994,983
Exercisable, end of period		4,173,396
Price
Outstanding, beginning of period		$ 1.76
Granted		2.07
Exercised	[1]	0.70
Forfeited		2.67
Expired or exchanged		12.81
Outstanding, end of period		1.72
Exercisable, end of period		$ 1.36
Outstanding		7 years 1 month 8 days
Exercisable, end of period		5 years 9 months 5 days
Outstanding, end of period		$ 1,443
Exercisable, end of period		$ 1,376

[1] Cash received from option exercises for the three months ended May 31, 2014 and 2015 was $0.2 million and $0.1 million, respectively. The Company recorded an income tax benefit relating to the options exercised during the three months ended May 31, 2014 of $0.2 million. The Company did not record an income tax benefit relating to the options exercised during the three months ended May 31, 2015.