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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, 2022 $ 30,209 $ 9 $ 337,940 $ (1) $ (307,739) $ 0
Beginning balance, Shares at Mar. 31, 2022   8,711   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   6   0    
Stock-based compensation expense 2,377 $ 0 2,377 $ 0 0 0
Stock-based compensation expense, Shares   0        
Net loss (17,259) $ 0 0 0 (17,259) 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, 2023 15,329 $ 9 340,317 $ (1) (324,998) 2
Ending 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   122   0    
Stock-based compensation expense 1,508 $ 0 1,508 $ 0 0 0
Stock-based compensation expense, Shares   66   0    
Issuance of common stock from public offering, net 1,437 $ 1 1,436 $ 0 0 0
Issuance of common stock from public offering, Shares   1,173   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 $ 10 $ 343,261 $ (1) $ (339,669) $ 0
Ending balance, Shares at Mar. 31, 2024   10,078   0