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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock Common [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   0    
Stock-based compensation expense, shares   0   0    
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   0    
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   1   0    
Stock-based compensation expense, shares   0   0    
Stock-based compensation expense 660 $ 0 660 $ 0 0 0
Net loss (3,215) 0 0 0 (3,215) 0
Ending balance at Jun. 30, 2022 27,654 $ 9 338,600 $ (1) (310,954) 0
Ending balance, Shares at Jun. 30, 2022   8,712   0    
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    
Net loss (9,800)          
Ending balance at Dec. 31, 2022 22,289 $ 9 339,817 $ (1) (317,539) 3
Ending balance, Shares at Dec. 31, 2022   8,714   0    
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, shares   0   0    
Stock-based compensation expense 2,377 $ 0 2,377   0 0
Net loss (17,259) 0 0 $ 0 (17,259) 0
Unrealized gain (loss) on available-for-sale debt securities 2 $ 0 0 $ 0 0 2
Unrealized gain (loss) on available-for-sale debt securities, Shares   0   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    
Beginning balance at Jun. 30, 2022 27,654 $ 9 338,600 $ (1) (310,954) 0
Beginning balance, Shares at Jun. 30, 2022   8,712   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, shares   0   0    
Stock-based compensation expense 673 $ 0 673 $ 0 0 0
Net loss (3,321) 0 0 0 (3,321) 0
Ending balance at Sep. 30, 2022 25,006 $ 9 339,273 $ (1) (314,275) 0
Ending balance, Shares at Sep. 30, 2022   8,713   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, shares   0   0    
Stock-based compensation expense 544 $ 0 544 $ 0 0 0
Net loss (3,264) 0 0 0 (3,264) 0
Unrealized gain (loss) on available-for-sale debt securities 3 $ 0 0 $ 0 0 3
Unrealized gain (loss) on available-for-sale debt securities, Shares   0   0    
Ending balance at Dec. 31, 2022 22,289 $ 9 339,817 $ (1) (317,539) 3
Ending balance, Shares at Dec. 31, 2022   8,714   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    
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, shares   0   0    
Stock-based compensation expense 475 $ 0 475 $ 0 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, shares   0   0    
Stock-based compensation expense 675 $ 0 675 $ 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 (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    
Stock-based compensation expense, shares   66   0    
Stock-based compensation expense 157 $ 0 157 $ 0 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    
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