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Share-Based Payments (Tables)
 3 Months Ended
Jul. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Summary of allocation of share based compensation expense
Stock-based compensation expense was recognized as follows (table in thousands):
 
Three Months Ended
July 31,
 20242023
General and administrative$185 $184 
Sales and marketing40 66 
Research and development4 11 
Cost of oncology services29 162 
Total stock-based compensation expense$258 $423 
Summary of valuation assumptions for stock options Black-Scholes assumptions used to calculate the fair value of options granted during the three months ended July 31, 2024 and 2023 were as follows:
 
Three Months Ended
July 31,
 20242023
Expected term in years
6
6
Risk-free interest rates
4.48%
3.95%
Volatility
62.72%
62.83%
Dividend yield—%—%
Summary of stock option activity
The Company’s stock options activity for the three months ended July 31, 2024 was as follows:
 
Directors
and
Employees		Non-
Employees		TotalWeighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Life (Years)		Aggregate
Intrinsic
Value
Outstanding, April 30, 20241,883,166 36,331 1,919,497 $5.04 5.2$2,172,000 
Granted1,000 — 1,000 4.90 9.8
Exercised— — — — 
Forfeited— — — —   
Canceled(500)— (500)6.11 
Expired— — — —   
Outstanding, July 31, 20241,883,666 36,331 1,919,997 5.04 5.0$2,125,000 
Vested and expected to vest as of July 31, 20241,883,666 36,331 1,919,997 5.04 5.0$2,125,000 
Exercisable as of July 31, 20241,551,829 3,750 1,555,579 4.74 4.1$2,125,000