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Stock-based Payments (Tables)

12 Months Ended

Apr. 30, 2019

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,
	2019				2018
General and administrative	$	458			$	689
Sales and marketing	91				112
Research and development	14				166
TOS cost of sales	86				65
POS cost of sales	—				2
Total stock-based compensation expense	$	649			$	1,034

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, 2019 and 2018 were as follows:

	Year Ended April 30,
	2019		2018
Expected term in years	3 - 6		3 - 6
Risk-free interest rates	2.6% - 3.0%		1.8% - 2.6%
Volatility	65% - 85%		84% - 88%
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, 2019 and 2018 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, 2018	50,000			2,655,845			2,705,845			$	2.85			5.9		$	5,265,000
Granted	—			206,790			206,790			9.86				7.9		$	77,000
Exercised	—			(363,383	)		(363,383	)		2.22
Canceled	—			(49,766	)		(49,766	)		3.20
Forfeited	—			(9,750	)		(9,750	)		3.50
Expired	—			(66,110	)		(66,110	)		15.10
Outstanding, April 30, 2019	50,000			2,373,626			2,423,626			3.19				5.3		$	14,557,000
Vested and expected to vest as of April 30, 2019	50,000			2,373,626			2,423,626			3.19				5.3		$	14,557,000
Vested as of April 30, 2019	18,335			2,115,585			2,133,920			2.70				4.9		$	13,785,000

	Non- Employees			Directors and Employees			Total			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding, May 1, 2017	50,000			2,258,704			2,308,704			$	2.86			6.1		$	1,282,000
Granted	—			455,310			455,310			3.01				9.6		603,000
Exercised	—			(12,500	)		(12,500	)		3.00
Canceled	—			—			—			—
Forfeited	—			(7,042	)		(7,042	)		6.86
Expired	—			(38,627	)		(38,627	)		5.21
Outstanding, April 30, 2018	50,000			2,655,845			2,705,845			2.85				5.9		$	5,265,000
Vested and expected to vest as of April 30, 2018	50,000			2,655,845			2,705,845			2.85				5.9		$	5,265,000
Vested as of April 30, 2018	25,836			2,436,263			2,462,099			2.79				5.6		$	5,036,000

Schedule Of Stock-based Compensation Warrants Activity

Activity related to these warrants, which expire in March 2020, is summarized as follows:

	Number of Shares			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)			Aggregate Intrinsic Value
Outstanding, May 1, 2018	2,004,284			$	5.57			1.8			$	—
Granted	—			—				—			—
Exercised	(247,468	)		5.28				—			905,000
Forfeited	(85,376	)		4.80				—			388,000
Expired	—			—				—			—
Outstanding, April 30, 2019	1,671,440			$	6.20			0.9			$	5,730,000

	Number of Shares			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)			Aggregate Intrinsic Value
Outstanding, May 1, 2017	2,004,284			$	5.57			2.8			$	—
Granted	—			—				—			—
Exercised	—			—				—			—
Forfeited	—			—				—			—
Expired	—			—				—			—
Outstanding, April 30, 2018	2,004,284			$	5.57			1.8			$	—

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for warrants that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, 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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