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Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares 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 $ 39,196,000 $ 9,000 $ 335,479,000 $ (1,000) $ (296,291,000) $ 0
Beginning balance, Shares at Mar. 31, 2021   8,671   0    
Issuance of common stock from public offering, net 251,000 $ 0 251,000 $ 0 0 0
Issuance of common stock from public offering, Shares   27        
Stock-based compensation expense 415,000 $ 0 415,000 0 0 0
Net loss (2,532,000) 0 0 0 (2,532,000) 0
Ending balance at Jun. 30, 2021 37,330,000 $ 9,000 336,145,000 $ (1,000) (298,823,000) 0
Ending balance, Shares at Jun. 30, 2021   8,698   0    
Beginning balance at Mar. 31, 2021 39,196,000 $ 9,000 335,479,000 $ (1,000) (296,291,000) 0
Beginning balance, Shares at Mar. 31, 2021   8,671   0    
Net loss (9,537,000)          
Ending balance at Dec. 31, 2021 31,293,000 $ 9,000 337,113,000 $ (1,000) (305,828,000) 0
Ending balance, Shares at Dec. 31, 2021   8,705   0    
Beginning balance at Jun. 30, 2021 37,330,000 $ 9,000 336,145,000 $ (1,000) (298,823,000) 0
Beginning balance, Shares at Jun. 30, 2021   8,698   0    
Issuance of common stock under employee and director stock option, RSU, and purchase plans (45,000) $ 0 (45,000) $ 0 0 0
Issuance of common stock under employee and director stock option, restricted stock units, and purchase plans, Shares   7        
Stock-based compensation expense 426,000 $ 0 426,000 0 0 0
Net loss (3,505,000) 0 0 0 (3,505,000) 0
Ending balance at Sep. 30, 2021 34,206,000 $ 9,000 336,526,000 $ (1,000) (302,328,000) 0
Ending balance, Shares at Sep. 30, 2021   8,705   0    
Issuance of common stock under employee and director stock option, RSU, and purchase plans (1,000) $ 0 (1,000) $ 0 0 0
Issuance of common stock under employee and director stock option, restricted stock units, and purchase plans, Shares   0        
Stock-based compensation expense 588,000 $ 0 588,000 0 0 0
Net loss (3,500,000) 0 0 0 (3,500,000) 0
Ending balance at Dec. 31, 2021 31,293,000 $ 9,000 337,113,000 $ (1,000) (305,828,000) 0
Ending balance, Shares at Dec. 31, 2021   8,705   0    
Beginning balance at Mar. 31, 2022 30,209,000 $ 9,000 337,940,000 $ (1,000) (307,739,000) 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, restricted stock units, and purchase plans, Shares   1        
Stock-based compensation expense 660,000 $ 0 660,000 0 0 0
Net loss (3,215,000) 0 0 0 (3,215,000) 0
Ending balance at Jun. 30, 2022 27,654,000 $ 9,000 338,600,000 $ (1,000) (310,954,000) 0
Ending balance, Shares at Jun. 30, 2022   8,712   0    
Beginning balance at Mar. 31, 2022 30,209,000 $ 9,000 337,940,000 $ (1,000) (307,739,000) 0
Beginning balance, Shares at Mar. 31, 2022   8,711   0    
Net loss (9,800,000)          
Ending balance at Dec. 31, 2022 22,289,000 $ 9,000 339,817,000 $ (1,000) (317,539,000) 3,000
Ending balance, Shares at Dec. 31, 2022   8,714   0    
Beginning balance at Jun. 30, 2022 27,654,000 $ 9,000 338,600,000 $ (1,000) (310,954,000) 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, restricted stock units, and purchase plans, Shares   1        
Stock-based compensation expense 673,000 $ 0 673,000 0 0 0
Net loss (3,321,000) 0 0 0 (3,321,000) 0
Ending balance at Sep. 30, 2022 $ 25,006,000 $ 9,000 339,273,000 $ (1,000) (314,275,000) 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
Issuance of common stock under employee and director stock option, restricted stock units, and purchase plans, Shares 0 1   0    
Stock-based compensation expense $ 544,000 $ 0 544,000 $ 0 0 0
Net loss (3,264,000) $ 0 0 0 (3,264,000) 0
Unrealized gain on available-for-sale debt securities 3,000   0 0 0 3,000
Unrealized gain on available-for-sale debt securities, Shares   0        
Ending balance at Dec. 31, 2022 $ 22,289,000 $ 9,000 $ 339,817,000 $ (1,000) $ (317,539,000) $ 3,000
Ending balance, Shares at Dec. 31, 2022   8,714   0