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Business Segment Information - Summary of Disaggregated Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Total Revenues $ 28 $ 30 $ 65 $ 69
Operating expenses        
Cost of revenues 0 1 0 3
Research and development expenses 923 984 1,924 2,386
Selling, general and administrative expenses 1,740 1,653 3,691 3,674
Royalty [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 28 28 65 53
Product [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 0 2 0 16
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 28 30 65 69
Operating expenses        
Cost of revenues 0 1 0 3
Research and development expenses 855 902 1,787 2,220
Selling, general and administrative expenses 1,677 1,511 3,558 3,391
Non-cash stock-based compensation 72 155 150 311
Depreciation and amortization 59 69 120 138
Total operating expense 2,663 2,638 5,615 6,063
Consolidated operating loss (2,635) (2,608) (5,550) (5,994)
Operating Segments [Member] | Royalty [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 28 28 65 53
Operating Segments [Member] | Product [Member]        
Segment Reporting Information [Line Items]        
Total Revenues $ 0 $ 2 $ 0 $ 16