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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 $ 1 $ 340,325 $ (1) $ (324,998) $ 2
Beginning balance, Shares at Mar. 31, 2023   727   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   10   0    
Stock-based compensation expense 1,508 $ 0 1,508 $ 0 0 0
Stock-based compensation expense, Shares   5   0    
Issuance of common stock from public offering, net 1,437 $ 0 1,437 $ 0 0 0
Issuance of common stock from public offering, Shares   98   0    
Net loss (14,671) $ 0 0 $ 0 (14,671) 0
Unrealized loss on available-for-sale debt securities, net of tax (2) $ 0 0 0 0 (2)
Unrealized loss on available-for-sale debt securities, net of tax, Shares   0        
Ending balance at Mar. 31, 2024 3,601 $ 1 343,270 $ (1) (339,669) 0
Ending balance, Shares at Mar. 31, 2024   840   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   10   0    
Issuance of common stock under warrants exercise 80 80 $ 0 0 0
Issuance of common stock under warrants exercise, Shares   425   0    
Stock-based compensation expense 532 $ 0 532 $ 0 0 0
Stock-based compensation expense, Shares   0        
Issuance of common stock from public offering, net 8,767 $ 1 8,766 $ 0 0 0
Issuance of common stock from public offering, Shares   623   0    
Net loss (2,488) $ 0 0 $ 0 (2,488) 0
Ending balance at Mar. 31, 2025 $ 10,492 $ 2 $ 352,648 $ (1) $ (342,157) $ 0
Ending balance, Shares at Mar. 31, 2025   1,898   0