Share-Based Payments (Tables)

9 Months Ended

12 Months Ended

Jan. 31, 2016

Apr. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

Stock-based compensation expense was recognized as follows (table in thousands):

	Three Months Ended January 31,				Nine Months Ended January 31,
	2016		2015		2016		2015
General and administrative	$	488	$	474	$	1,600	$	1,530
Sales and marketing		27		114		173		447
Research and development		49		65		262		267
TOS cost of sales		2		2		28		20
POS cost of sales		1		2		27		20
Total stock-based compensation expense	$	567	$	657	$	2,090	$	2,284

Stock-based compensation costs were recorded as follows (in thousands):

	Year Ended April 30,
	2015		2014
General and administrative	$	2,204	$	2,298
Sales and marketing		561		352
Research and development		352		36
TOS cost of sales		23		56
POS cost of sales		22		65
Total stock-based compensation expense	$	3,162	$	2,807

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, 2016 and 2015 were as follows:

	Three Months Ended January 31,				Nine Months Ended January 31,
	2016		2015		2016		2015
Expected term in years		2.5 –  6		—		2.5 – 6		3 – 6
Risk-free interest rates		0.995% – 1.75%		—		0.995% – 1.77%		0.79% – 1.94%
Volatility		82.72% – 91.98%		—		82.72% – 92.32%		85.8% – 102.1%
Dividend yield		0%		—		0%		0%

Black-Scholes assumptions used to calculate the fair value of options granted during the years ended April 30, 2015 and 2014 were as follows:

	Year Ended April 30,
	2015		2014
Expected term in years		2.5 – 6.0		3.0 – 6.0
Risk-free interest rates		0.8% – 1.9%		0.7% – 2.4%
Volatility		86% – 102%		84% – 102%
Dividend yield		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, 2016 was as follows:

	Non- Employees			Directors and Employees			Total			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding, May 1, 2015		57,917			1,946,085			2,004,002		$	5.74		6.7	$	4,166,000
Granted		—			331,582			331,582			5.33		8.9		—
Exercised		—			—			—			—
Forfeited		—			(38,140	)		(38,140	)		6.64
Expired		(6,667	)		(78,206	)		(84,873	)		6.91
Outstanding, January 31, 2016		51,250			2,161,321			2,212,571			5.61		6.4	$	1,000
Vested and expected to vest as of January 31, 2016		51,250			2,161,321			2,212,571			5.61		6.4	$	1,000
Exercisable as of January 31, 2016		34,271			1,644,223			1,678,494			5.76		5.8	$	1,000

The Company’s stock options activity and related information as of and for the years ended April 30, 2015 and 2014 is as follows (dollars in thousands):

	Non- Employees			Directors and Employees			Total			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding, May 1, 2014		63,750			1,882,170			1,945,920		$	12.12		7.5	$	985,000
Granted		6,667			1,756,714			1,763,380			7.92
Exercised		—			(313	)		(313	)		5.88
Canceled		—			(1,656,073	)		(1,656,073	)		12.48
Forfeited		—			(12,604	)		(12,604	)		11.52
Expired		(12,500	)		(23,809	)		(36,309	)		11.88
Outstanding, April 30, 2015		57,917			1,946,085			2,004,002			5.74		6.7	$	4,166,000
Vested and expected to vest as of April 30, 2015		57,917			1,946,085			2,004,002					6.7	$	4,166,000
Vested as of April 30, 2015		40,625			1,385,298			1,425,923			5.88		5.9	$	2,879,000

	Non- Employees		Directors and Employees			Total			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding, May 1, 2013		63,750		1,093,767			1,157,517		$	10.20		7.0	$	89,000
Granted		—		816,111			816,111			14.76
Exercised		—		(2,813	)		(2,813	)		7.56
Canceled		—		—			—			—
Forfeited		—		(6,042	)		(6,042	)		9.84
Expired		—		(18,854	)		(18,854	)		8.76
Outstanding, April 30, 2014		63,750		1,882,170			1,945,920			12.12		7.5	$	985,000
Vested and expected to vest as of April 30, 2014		63,750		1,882,170			1,945,920					7.5	$	985,000
Vested as of April 30, 2014		43,524		1,086,857			1,130,381			10.20		6.1	$	927,000

Schedule Of Share Based Compensation Warrants Activity [Table Text Block]

Activity related to these warrants, which expire at various dates through January 2019, is summarized as follows:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding, May 1, 2015		2,109,840	$	5.54		4.6	$	3,764,871
Granted		—		—		—		—
Exercised		—		—		—		—
Expired		—		—		—		—
Outstanding, January 31, 2016		2,109,840	$	5.54		3.9	$	—

Activity related to these warrants, which expire at various dates through January 2019, is summarized as follows (dollars in thousands):

	Number of Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding, May 1, 2014		273,056		$	7.32		2.9	$	984,333
Granted		1,849,285			5.64		4.9		3,108,271
Exercised		—			—		—		—
Forfeited		—			—		—		—
Expired		(12,500	)		—		—		—
Outstanding, April 30, 2015		2,109,840		$	5.82		4.6	$	3,247,604

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding, May 1, 2013		273,056	$	7.32		3.9	$	—
Granted		—		—		—		—
Exercised		—		—		—		—
Forfeited		—		—		—		—
Expired		—		—		—		—
Outstanding, April 30, 2014		273,056	$	7.32		2.9	$	984,333