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Business Segment Information - Summary of Disaggregated Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Total Revenues $ 144 $ 109
Operating expenses    
Cost of revenues 5  
Research and development 5,025 5,498
Selling, general, and administrative expenses 7,730 9,697
Royalty [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 119 109
Product [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 25  
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 144 109
Operating expenses    
Cost of revenues 5 0
Research and development 4,712 5,133
Selling, general, and administrative expenses 7,245 8,274
Non-cash stock-based compensation 532 1,508
Depreciation and amortization 266 280
Total operating expenses 12,760 15,195
Consolidated operating loss (12,616) (15,086)
Operating Segments [Member] | Royalty [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 119 109
Operating Segments [Member] | Product [Member]    
Segment Reporting Information [Line Items]    
Total Revenues $ 25  
Operating expenses    
Consolidated operating loss   $ 0