Stock-based Payments (Tables)

12 Months Ended

Apr. 30, 2017

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

Schedule of Employee Service Stock-based Compensation, Allocation of Recognized Period Costs

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

	Year Ended April 30,
	2017		2016
General and administrative	$	2,193	$	2,035
Sales and marketing	201		198
Research and development	216		308
TOS cost of sales	50		31
POS cost of sales	2		27
Total stock-based compensation expense	$	2,662	$	2,599

Schedule of Stock-based Payment Award, Stock Options, Valuation Assumptions

Black-Scholes assumptions used to calculate the fair value of options granted during the years ended April 30, 2017 and 2016 were as follows:

	Year Ended April 30,
	2017	2016
Expected term in years	3 - 6	2.5 - 6.0
Risk-free interest rates	0.6% - 1.9%	0.6% - 1.8%
Volatility	72% - 88%	83% - 93%
Dividend yield	—%	—%

Schedule of Stock-based Compensation, Stock Options, Activity

The Company’s stock options activity and related information as of and for the years ended April 30, 2017 and 2016 is as follows:

	Non- Employees		Directors and Employees		Total		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding, May 1, 2016	51,250		2,161,507		2,212,757		$	5.58	6.1	$	10,000
Granted	—		2,420,681		2,420,681		1.99
Exercised	—		—		—		—
Canceled	—		(1,793,779	)	(1,793,779	)	4.92
Forfeited	—		(421,487	)	(421,487	)	2.03
Expired	(1,250	)	(108,218	)	(109,468	)	7.86
Outstanding, April 30, 2017	50,000		2,258,704		2,308,704		2.86		6.1	$	1,282,000
Vested and expected to vest as of April 30, 2017	50,000		2,258,704		2,308,704				6.1	$	1,282,000
Vested as of April 30, 2017	33,336		2,028,469		2,061,805		2.93		5.9	$	1,101,000

	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	—		343,749		343,749		5.33
Exercised	—		—		—		—
Canceled	—		—		—		—
Forfeited	—		(42,515	)	(42,515	)	6.90
Expired	(6,667	)	(85,812	)	(92,479	)	6.97
Outstanding, April 30, 2016	51,250		2,161,507		2,212,757		5.58		6.1	$	10,000
Vested and expected to vest as of April 30, 2016	51,250		2,161,507		2,212,757				6.1	$	10,000
Vested as of April 30, 2016	34,271		1,703,035		1,737,306		5.71		5.6	$	9,000

Schedule Of Stock-based Compensation Warrants Activity

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, 2016	2,109,840		$	5.54	3.6	$	—
Granted	—		—		—	—
Exercised	—		—		—	—
Forfeited	—		—		—	—
Expired	(105,556	)	4.80		—	—
Outstanding, April 30, 2017	2,004,284		$	5.57	2.8	$	—

	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	$	3,248
Granted	—	—		0	—
Exercised	—	—		—	—
Forfeited	—	—		—	—
Expired	—	—		—	—
Outstanding, April 30, 2016	2,109,840	$	5.54	3.6	$	—