Annual report pursuant to Section 13 and 15(d)

Fair Value of Warrants (Detail)

v3.10.0.1
Fair Value of Warrants (Detail)
12 Months Ended
Feb. 06, 2015
Sep. 26, 2014
May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Warrants risk free interest rate 1.48% 1.82% 0.84%
Warrants expected life 5 years 5 years 1 month
Warrants expected volatility 119.00% 136.00% 61.48%
Warrants expected dividend yield 0.00% 0.00% 0.00%