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Condensed Consolidated Statements of Operations and Other Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Revenues            
Total Revenues $ 5 $ 131 $ 80 $ 208 $ 370 $ 1,500
Revenue From Contract With Customer Product And Service [Extensible List] us-gaap:RoyaltyMember us-gaap:RoyaltyMember us-gaap:RoyaltyMember us-gaap:RoyaltyMember us-gaap:RoyaltyMember us-gaap:RoyaltyMember
Research and development expenses $ 1,434 $ 1,185 $ 4,435 $ 3,436 $ 8,885 $ 3,320
Selling, general, and administrative expenses 2,251 2,305 7,635 6,724 9,216 9,659
Total costs and expenses 3,685 3,490 12,070 10,160 18,101 12,979
Loss from Operations (3,680) (3,359) (11,990) (9,952) (17,731) (11,479)
Other Income (Expense)            
Loss on fixed asset disposals         (9) 0
(Loss) gain on investment in equity securities 0 (48) 12 (123) 29 0
Interest income 76 143 354 277 454 8
Other income         0 25
Total Other Income 76 95 366 154 474 33
Income Tax Expense 0 0 (2) (2) (2) (2)
Net Loss (3,604) (3,264) (11,626) (9,800) (17,259) (11,448)
Other Comprehensive Income (Loss):            
Unrealized gain (loss) on available-for-sale debt securities 0 3 (1) 3 2 0
Comprehensive Loss $ (3,604) $ (3,261) $ (11,627) $ (9,797) $ (17,257) $ (11,448)
Net loss per common share basic $ (0.4) $ (0.37) $ (1.31) $ (1.13) $ (1.98) $ (1.32)
Net loss per common share diluted $ (0.4) $ (0.37) $ (1.31) $ (1.13) $ (1.98) $ (1.32)
Weighted average shares used in computing net loss per common share basic 9,115,455 8,713,617 8,850,881 8,712,294 8,713,032 8,703,596
Weighted average shares used in computing net loss per common share diluted 9,115,455 8,713,617 8,850,881 8,712,294 8,713,032 8,703,596