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Redeemable Common Stock and Stock Purchase Warrants (Tables)

9 Months Ended

Jan. 31, 2014

Redeemable Common Stock and Stock Purchase Warrant [Abstract]

Schedule of Share-based Payment Award Stock Warrants Valuation Assumptions [Table Text Block]

Assumptions used to calculate the fair value of these warrants were as follows:

		January 31,			April 30,
		2014			2013
Expected term in years			2.2 & 3.9			2.9 & 4.7
Risk-free interest rates			0.7% & 1.5%			0.3%
Volatility			93% & 107%			95% & 98%
Dividend yield.			0%			0%

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock warrants, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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