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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, 2021 $ 39,196 $ 9 $ 335,479 $ (1) $ (296,291) $ 0
Beginning balance, Shares at Mar. 31, 2021   8,671   0    
Issuance of common stock under employee and director stock option, RSU and purchase plans (46) $ 0 (46) $ 0 0 0
Issuance of common stock under employee and director stock option, RSU and purchase plans, Shares   13        
Stock-based compensation expense 2,256 $ 0 2,256 0 0 0
Issuance of common stock from public offering, net 251 $ 0 251 0 0 0
Issuance of common stock from public offering, Shares   27        
Net loss (11,448) $ 0 0 0 (11,448) 0
Ending balance at Mar. 31, 2022 30,209 $ 9 337,940 $ (1) (307,739) 0
Ending 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        
Stock-based compensation expense 2,377 $ 0 2,377 0 0 0
Net loss (17,259) 0 0 0 (17,259) 0
Unrealized gain on available-for-sale debt securities 2 $ 0 0 0 0 2
Unrealized gain on available-for-sale debt securities, 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