Share-Based Payments (Tables)

9 Months Ended

Jan. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

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

As of January 31, 2015, $158 of stock compensation is included within accrued liabilities line item on the balance sheet. Stock-based compensation expense was recognized as follows (in thousands):

	Three Months Ended				Nine Months Ended
	January 31,				January 31,
	2015		2014		2015		2014
General and administrative	$	474	$	866	$	1,530	$	1,686
Sales and marketing		114		63		447		189
Research and development		65		4		267		19
TOS cost of sales		2		2		20		12
POS cost of sales		2		6		20		62
Total stock-based compensation expense	$	657	$	941	$	2,284	$	1,968

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

Black-Scholes assumptions used to calculate the fair value of options granted during the three and nine months ended January 31, 2015 and 2014 were as follows (in thousands):

	Three Months Ended		Nine Months Ended
	January 31,		January 31,
	2015	2014	2015	2014
Expected term in years	-	5 - 6	3 - 6	5 - 6
Risk-free interest rates	-	1.4% - 2.1%	0.79% - 1.94%	0.8% - 2.4%
Volatility	-	97% - 102%	85.8% - 102.1%	97% - 102%
Dividend yield	-	0%	0%	0%

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

The Company’s stock options activity for the nine months ended January 31, 2015 is as follows:

						Weighted
				Weighted		Average
		Directors		Average		Remaining	Aggregate
	Non-	and		Exercise		Contractual	Intrinsic
	Employees	Employees	Total	Price		Life (Years)	Value
Outstanding, May 1, 2014	765,000	22,586,037	23,351,037	$	1.01	7.5	$	985
Granted	80,000	1,013,175	1,093,175		0.72	5.9		-
Exercised	-	(3,750)	(3,750)		0.49
Forfeited	-	(101,250)	(101,250)		0.96
Expired	(150,000)	(199,204)	(349,204)		1.04
Outstanding, January 31, 2015	695,000	23,295,008	23,990,008		1.00	6.6		63
Vested and expected to vest as of January 31, 2015	695,000	23,295,008	23,990,008		1.00	6.6		63
Exercisable as of January 31, 2015	487,500	16,544,466	17,031,966		0.91	5.8		62

Warrant [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

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

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

	January 31,	April 30,
	2015	2014
Expected term in years	1.2 - 3.0	1.9 - 3.7
Risk-free interest rates	0.6% - 1.05%	0.4% - 1.17%
Volatility	73% - 100%	95% - 113%
Dividend yield	0%	0%

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

Activity related to these warrants, which expire at various dates through April 2016, is summarized as follows (dollars in thousands):

				Weighted
		Weighted		Average
	Number	Average		Remaining	Aggregate
	of	Exercise		Contractual	Intrinsic
	Shares	Price		Life (Years)	Value
Outstanding, May 1, 2014	3,276,667	$	0.61	2.9	$	984
Granted	-		-	-		-
Exercised	-		-	-		-
Expired	(150,000)		-	-		-
Outstanding, January 31, 2015	3,126,667	$	0.60	2.3	$	-