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Share-Based Payments (Tables)
 3 Months Ended
Jul. 31, 2020
Share-based Payment Arrangement [Abstract]  
Allocation of Share Based Compensation Expense
Stock-based compensation expense was recognized as follows (table in thousands):
 
 
Three Months Ended
July 31,
 
 
2020

2019
 
General and administrative
$
47

 
$
132

 
Sales and marketing
48

 
22

 
Research and development
4

 
3

 
Cost of oncology services
21

 
(26
)
 
Total stock-based compensation expense
$
120

 
$
131

 
Valuation Assumptions for Stock Options
Black-Scholes assumptions used to calculate the fair value of options granted during the three months ended July 31, 2020 and 2019 were as follows:
 
 
Three Months Ended
July 31,
 
 
2020

2019
 
Expected term in years
6
 
—
 
Risk-free interest rates
0.39%
 
—%
 
Volatility
72.64%
 
—%
 
Dividend yield
—%
 
—%
 
Summary of Stock Option Activity
The Company’s stock options activity for the three months ended July 31, 2020 was as follows:
 
 
Directors
and
Employees
Non-
Employees
 
 
Total
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value
Outstanding, April 30, 2020
2,228,326

43,332

 
 
2,271,658

 
$
3.23

 
5.0
 
$
10,663,000

Granted
7,500

—

 
 
7,500

 
8.94

 
9.85
 
 
Exercised


(1,160
)
 
 
(1,160
)
 
4.20

 
 
 


Forfeited
(500
)
—

 
 
(500
)
 
2.51

 
 
 
 

Canceled
(312
)
(923
)
 
 
(1,235
)
 
4.95

 
 
 
 
Expired
—

—

 
 
—

 


 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
Outstanding, July 31, 2020
2,235,014

41,249

 
 
2,276,263

 
3.24

 
4.81
 


 
 
 
 
 
 
 
 
 
 
 
 
Vested and expected to vest as of July 31, 2020
2,235,014

41,249

 
 
2,276,263

 
3.24

 
4.81
 


 
 
 
 
 
 
 
 
 
 
 
 
Exercisable as of July 31, 2020
1,942,264

15,418

 
 
1,957,682

 
2.85

 
4.21
 
$
11,810,000