Common Stock (Tables)

9 Months Ended

Jan. 31, 2015

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

	Three Months Ended		Nine Months Ended
	January 31,		January 31,
	2015	2014	2015	2014
Risk-free interest rate	1.53%	1.58%	1.67%	1.61%
Expected volatility	54.50%	70.32%	57.50%	68.09%
Expected term	3.7 years	3.7 years	3.7 years	3.7 years
Dividend yield	0%	0%	0%	0%

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Weighted Average
	Number of			Exercise Price
	Options			per Share
Outstanding at April 30, 2014	3,705,539		$	1.62
Granted	871,000		$	1.12
Exercised (1)	(334,731	)	$	0.60
Forfeited/Cancelled	(481,225	)	$	1.40
Outstanding at January 31, 2015	3,760,583		$	1.62
Exercisable at January 31, 2015	1,916,875		$	1.79
Exercisable at April 30, 2014	1,767,621		$	1.60

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

	Number of		Aggregate		Number of		Aggregate
	Options		Intrinsic		Options		Intrinsic
Exercise Price	Outstanding		Value	Expiry Date	Exercisable		Value
				August 21, 2015 to
$0.47	122,750	$	31,719	September 26, 2016	122,750	$	31,719
$0.78	34,000		–	December 12, 2019	–		–
$1.05	137,000		–	September 12, 2019	–		–
$1.15	700,000		–	July 11, 2019	87,500		–
$1.23	20,833		–	January 13, 2019	20,833		–
$1.31	600,000		–	December 12, 2018	162,500		–
$1.41	100,000		–	October 1, 2018	31,250		–
$1.70	650,000		–	December 14, 2016	501,042		–
				December 14, 2015 to
$1.90	845,000		–	July 25, 2018	554,375		–
$2.00	6,000		–	February 28, 2015	6,000		–
$2.15	240,000		–	September 7, 2016	240,000		–
$2.90	305,000		–	July 19, 2017	190,625		–
January 31, 2015	3,760,583	$	31,719		1,916,875	$	31,719
April 30, 2014	3,705,539	$	353,637		1,767,621	$	332,137

Schedule of Nonvested Performance-based Units Activity [Table Text Block]

				Weighted
	Number of			Average Grant
	Options			Date Fair Value
Non-vested options at April 30, 2014	1,937,918		$	0.87
Granted	871,000		$	0.49
Vested	(622,293	)	$	0.87
Cancelled/Forfeited	(342,917	)	$	0.68
Non-vested options at January 31, 2015	1,843,708		$	0.72

Schedule of Employee and Non-Employee Service Share-based Compensation Allocation of Recognized Period Costs [Table Text Block]

		Three Months Ended				Nine Months Ended
		January 31,				January 31,
		2015		2014		2015		2014
Cost of sales	$	22,617	$	18,189	$	58,704	$	45,027
Sales and marketing		86,265		72,517		212,699		269,790
Research and development		21,014		15,339		51,026		39,876
General and administrative		59,390		50,682		180,411		121,252
Total stock-option based compensation		189,286	$	156,727	$	502,840	$	475,945

Schedule of Stockholders' Equity Note, Warrant Liability [Table Text Block]

		January 31,		April 30,
		2015		2014
Opening balance at the beginning of the period/year	$	–	$	93,057
Fair value of warrant liability, at issuance		–		–
Change in fair value of warrant liability		–		(93,057	)
Fair value of warrants exercised during the period/year		–		–
Fair value of warrant liability at end of period/year	$	–	$	–

Schedule of Stockholders' Equity Note, Warrants or Rights, Valuation Assumptions [Table Text Block]

			As at the date of
	As at	As at	issuance
	January 31, 2015	April 30, 2014	June 14, 2011
Risk-free interest rate	–	–	1.60%
Expected volatility	–	–	70%
Expected term	–	–	1.5 years to 2 years
Dividend yield	–	–	0%

Schedule of Stockholders' Equity Note, Warrants or Rights, Activity [Table Text Block]

	Number of			Weighted Average
	Warrants			Exercise Price	Expiry Dates
Warrants at April 30, 2014	732,500		$	3.25	June 19, 2014
Granted	–			–	–
Exercised	–			–	–
Expired	(732,500	)	$	3.25	–
Warrants at January 31, 2015	–			–	–

Schedule of Stockholders Equity Deferred Share Unit Plan [Table Text Block]

			Weighted
			Average Grant
			Date Fair
	Number of DSUs		Value Per Unit
DSUs outstanding at April 30, 2014	1,672,434	$	1.09
Granted	326,613	$	1.17
Conversions	–		–
DSUs outstanding at January 31, 2015	1,999,047	$	1.10

Schedule of Stockholders Equity Non Vested Deferred Share Units [Table Text Block]

				Weighted
				Average Grant
				Date Fair
	Number of DSUs			Value Per Unit
Non-vested DSUs at April 30, 2014	156,778		$	2.16
Granted	326,613		$	1.17
Vested	(231,701	)	$	1.52
Non-vested DSUs at January 31, 2015	251,690		$	1.47

Schedule of Allocation of Share Based Compensation Costs for Deferred Share Units [Table Text Block]

		Three Months Ended				Nine Months Ended
		January 31,				January 31,
		2015		2014		2015		2014
Sales and marketing	$	–	$	6,667	$	1,667	$	20,001
Research and development		2,082		2,082		6,246		6,246
General and administrative		41,974		45,507		292,709		345,834
Total DSU-based compensation	$	44,056	$	54,256	$	300,622	$	372,081