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Stock-based Payments (Tables)
 12 Months Ended
Apr. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Employee Service Stock-based Compensation, Allocation of Recognized Period Costs
tock-based compensation costs were recorded as follows (in thousands):
 
Year Ended April 30,
 
2018
 
2017
General and administrative
$
689

 
$
2,193

Sales and marketing
112

 
201

Research and development
166

 
216

TOS cost of sales
65

 
50

POS cost of sales
2

 
2

 
 
 
 
Total stock-based compensation expense
$
1,034

 
$
2,662
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, 2018 and 2017 were as follows:
 
Year Ended April 30,
 
2018
 
2017
Expected term in years
3 - 6
 
3 - 6
Risk-free interest rates
1.8% - 2.6%
 
0.6% - 1.9%
Volatility
84% - 88%
 
72% - 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, 2018 and 2017 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, 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

 
 
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
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, 2017
2,004,284

 
$
5.57

 
2.8

 
$
—

Granted
—

 
—

 
—

 
—

Exercised
—

 
—

 
—

 
—

Forfeited
—

 
—

 
—

 
—

Expired
—

 
—

 
—

 
—

 
 
 
 
 
 
 
 
Outstanding, April 30, 2018
2,004,284

 
$
5.57

 
1.8

 
$
—


 
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

 
$
—