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Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income [Member]
Beginning balance at Mar. 31, 2023 $ 15,329 $ 9 $ 340,317 $ (1) $ (324,998) $ 2
Beginning balance, Shares at Mar. 31, 2023   8,717   0    
Issuance of common stock under employee and director stock option, RSU, and purchase plans 0 $ 0 0 $ 0 0 0
Issuance of common stock under employee and director stock option, RSU, and purchase plans, Shares   1   0    
Stock-based compensation expense 475 $ 0 475 $ 0 0 0
Stock-based compensation expense, Shares   0   0    
Net loss (4,028) $ 0 0 $ 0 (4,028) 0
Ending balance at Jun. 30, 2023 11,776 $ 9 340,792 $ (1) (329,026) 2
Ending balance, Shares at Jun. 30, 2023   8,718   0    
Beginning balance at Mar. 31, 2023 15,329 $ 9 340,317 $ (1) (324,998) 2
Beginning balance, Shares at Mar. 31, 2023   8,717   0    
Net loss (11,626)          
Ending balance at Dec. 31, 2023 6,182 $ 10 342,796 $ (1) (336,624) 1
Ending balance, Shares at Dec. 31, 2023   9,839   0    
Beginning balance at Jun. 30, 2023 11,776 $ 9 340,792 $ (1) (329,026) 2
Beginning balance, Shares at Jun. 30, 2023   8,718   0    
Issuance of common stock under employee and director stock option, RSU, and purchase plans 0 $ 0 0 $ 0 0 0
Issuance of common stock under employee and director stock option, RSU, and purchase plans, Shares   1   0    
Stock-based compensation expense 675 $ 0 675 $ 0 0 0
Stock-based compensation expense, Shares   0   0    
Net loss (3,994) $ 0 0 $ 0 (3,994) 0
Unrealized gain (loss) on available-for-sale debt securities (1) $ 0 0 $ 0 0 (1)
Unrealized gain (loss) on available-for-sale debt securities, Shares   0   0    
Ending balance at Sep. 30, 2023 8,456 $ 9 341,467 $ (1) (333,020) 1
Ending balance, Shares at Sep. 30, 2023   8,719   0    
Issuance of common stock under employee and director stock option, RSU, and purchase plans 0 $ 0 0 $ 0 0 0
Issuance of common stock under employee and director stock option, RSU, and purchase plans, Shares   119   0    
Issuance of common stock from public offering, net 1,173 $ 1 1,172 $ 0 0 0
Issuance of common stock from public offering, Shares   935   0    
Stock-based compensation expense 157 $ 0 157 $ 0 0 0
Stock-based compensation expense, Shares   66   0    
Net loss (3,604) $ 0 0 $ 0 (3,604) 0
Ending balance at Dec. 31, 2023 6,182 $ 10 342,796 $ (1) (336,624) 1
Ending balance, Shares at Dec. 31, 2023   9,839   0    
Beginning balance at Mar. 31, 2024 3,601 $ 10 343,261 $ (1) (339,669) 0
Beginning balance, Shares at Mar. 31, 2024   10,078   0    
Issuance of common stock under employee and director stock option, RSU, and purchase plans 0 $ 0 0 $ 0 0 0
Issuance of common stock under employee and director stock option, RSU, and purchase plans, Shares   1   0    
Issuance of common stock from exercise of pre-funded warrants 1 $ 1 0 $ 0 0 0
Issuance of common stock from exercise of pre-funded warrants, Shares   1,379   0    
Issuance of common stock from public offering, net 6,248 $ 3 6,245 $ 0 0 0
Issuance of common stock from public offering, Shares   2,915   0    
Stock-based compensation expense 156 $ 0 156 $ 0 0 0
Stock-based compensation expense, Shares   0   0    
Net loss (3,344) $ 0 0 $ 0 (3,344) 0
Ending balance at Jun. 30, 2024 6,662 $ 14 349,662 $ (1) (343,013) 0
Ending balance, Shares at Jun. 30, 2024   14,373   0    
Beginning balance at Mar. 31, 2024 3,601 $ 10 343,261 $ (1) (339,669) 0
Beginning balance, Shares at Mar. 31, 2024   10,078   0    
Net loss (9,340)          
Ending balance at Dec. 31, 2024 364 $ 17 349,357 $ (1) (349,009) 0
Ending balance, Shares at Dec. 31, 2024   17,134   0    
Beginning balance at Jun. 30, 2024 6,662 $ 14 349,662 $ (1) (343,013) 0
Beginning balance, Shares at Jun. 30, 2024   14,373   0    
Issuance of common stock under employee and director stock option, RSU, and purchase plans 0 $ 0 0 $ 0 0 0
Issuance of common stock under employee and director stock option, RSU, and purchase plans, Shares   2   0    
Issuance of common stock from exercise of pre-funded warrants 1 $ 1 0 $ 0 0 0
Issuance of common stock from exercise of pre-funded warrants, Shares   991   0    
Stock-based compensation expense 155 $ 0 155 $ 0 0 0
Stock-based compensation expense, Shares   0   0    
Financing fees (590) $ 0 (590) $ 0 0 0
Financing fees, shares   0   0    
Net loss (2,549) $ 0 0 $ 0 (2,549) 0
Unrealized gain (loss) on available-for-sale debt securities 1 $ 0 0 $ 0 0 1
Unrealized gain (loss) on available-for-sale debt securities, Shares   0   0    
Ending balance at Sep. 30, 2024 3,680 $ 15 349,227 $ (1) (345,562) 1
Ending balance, Shares at Sep. 30, 2024   15,366   0    
Issuance of common stock under employee and director stock option, RSU, and purchase plans 0 $ 0 0 $ 0 0 0
Issuance of common stock under employee and director stock option, RSU, and purchase plans, Shares   119   0    
Issuance of common stock from exercise of pre-funded warrants 2 $ 2 0 $ 0 0 0
Issuance of common stock from exercise of pre-funded warrants, Shares   1,596   0    
Issuance of common stock from public offering, net 0 $ 0 0 $ 0 0 0
Issuance of common stock from public offering, Shares   53   0    
Stock-based compensation expense 130 $ 0 130 $ 0 0 0
Stock-based compensation expense, Shares   0   0    
Net loss $ (3,447) $ 0 $ 0 $ 0 $ (3,447) $ 0
Unrealized gain (loss) on available-for-sale debt securities, Shares (1) 0 0 0 0 (1)
Ending balance at Dec. 31, 2024 $ 364 $ 17 $ 349,357 $ (1) $ (349,009) $ 0
Ending balance, Shares at Dec. 31, 2024   17,134   0