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Restructuring Costs
12 Months Ended
Apr. 30, 2023
Restructuring and Related Activities [Abstract]  
Restructuring Costs Restructuring CostsIn December 2019, the Company initiated a restructuring, which included the closure of the Company's subsidiary in China, a commercial sales organization for the Company's products in China, that was completed in March 2023. The Company incurred operating expenses of $32,000 in its international operations related to the closure of the China subsidiary in fiscal year 2023, offset by the recovery of bad debt collections of $51,000 that were originally written off when the Company initiated the restructuring. The Company incurred operating expenses of $28,000 related to the closure in the prior year period. The Company reflected all the expenses as operating expenses in the Consolidated Statement of Operations.