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Business Segment Information - Summary of Disaggregated Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]    
Total Revenues $ 37 $ 39
Operating expenses    
Cost of revenues 0 2
Research and development expenses 1,001 1,402
Selling, general and administrative expenses 1,951 2,021
Royalty [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 37 25
Product [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 0 14
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 37 39
Operating expenses    
Cost of revenues 0 2
Research and development expenses 932 1,318
Selling, general and administrative expenses 1,881 1,879
Non-cash stock-based compensation 78 156
Depreciation and amortization 61 70
Total operating expense 2,952 3,425
Consolidated operating loss (2,915) (3,386)
Operating Segments [Member] | Royalty [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 37 25
Operating Segments [Member] | Product [Member]    
Segment Reporting Information [Line Items]    
Total Revenues $ 0 $ 14