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Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock [Member]
Conversion of Series B Preferred Stock to Common Stock [Member]
Preferred Stock [Member]
Conversion of Series C Preferred Stock to Common Stock [Member]
Preferred Stock [Member]
Series C Preferred Stock [Member]
Preferred Stock [Member]
Employees and Directors [Member]
Preferred Stock [Member]
Common Stock [Member]
Conversion of Series B Preferred Stock to Common Stock [Member]
Common Stock [Member]
Conversion of Series C Preferred Stock to Common Stock [Member]
Common Stock [Member]
Series F-2 Warrants [Member]
Common Stock [Member]
Series F-3 Warrants [Member]
Common Stock [Member]
Series C Preferred Stock [Member]
Common Stock [Member]
Employees and Directors [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Conversion of Series B Preferred Stock to Common Stock [Member]
Additional Paid-in Capital [Member]
Conversion of Series C Preferred Stock to Common Stock [Member]
Additional Paid-in Capital [Member]
Series F-2 Warrants [Member]
Additional Paid-in Capital [Member]
Series F-3 Warrants [Member]
Additional Paid-in Capital [Member]
Series C Preferred Stock [Member]
Additional Paid-in Capital [Member]
Employees and Directors [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Conversion of Series B Preferred Stock to Common Stock [Member]
Retained Earnings [Member]
Conversion of Series C Preferred Stock to Common Stock [Member]
Retained Earnings [Member]
Series F-2 Warrants [Member]
Retained Earnings [Member]
Series F-3 Warrants [Member]
Retained Earnings [Member]
Series C Preferred Stock [Member]
Retained Earnings [Member]
Employees and Directors [Member]
Retained Earnings [Member]
Conversion of Series B Preferred Stock to Common Stock [Member]
Conversion of Series C Preferred Stock to Common Stock [Member]
Series F-2 Warrants [Member]
Series F-3 Warrants [Member]
Series C Preferred Stock [Member]
Employees and Directors [Member]
Total
Balance (in shares) at Dec. 31, 2023         7             321                                          
Balance at Dec. 31, 2023         $ 1,950             $ 3             $ 176,210             $ (174,849)             $ 3,314
Net loss         $ 0             $ 0             0             (3,214)             (3,214)
Stock-based compensation expense related to employee and director stock awards       $ 0             $ 0             $ 60             $ 0             $ 60  
Balance (in shares) at Mar. 31, 2024         2             915                                          
Balance at Mar. 31, 2024         $ 1,485             $ 9             177,109             (178,443)             160
Conversion of Preferred Stock to common stock (in shares) (5) (0)       537 57                                                    
Conversion of Preferred Stock to common stock $ (231) $ (234)       $ 5 $ 1           $ 226 $ 233           $ 0 $ 0           $ 0 $ 0          
Adjustment of Preferred Stock conversion price     $ 0             $ 0             $ 380             $ (380)             $ 0    
Balance (in shares) at Dec. 31, 2024         1             4,885                                          
Balance at Dec. 31, 2024         $ 6             $ 49             183,273             (183,457)             (129)
Net loss         $ 0             0             0             7,670             7,670
Stock Issued In Connection with Exercise of Warrants, Shares (in shares)               403 528                                                
Stock Issued In Connection with Exercise of Warrants, Value               $ 4 $ 5           $ 262 $ 343           $ 0 $ 0           $ 266 $ 348      
Repurchase of warrants                       $ 0             (1,990)             0             (1,990)
Stock-based compensation expense related to employee and director stock awards       $ 0             $ 0             $ 2             $ 0             $ 2  
Balance (in shares) at Mar. 31, 2025         1             5,816                                          
Balance at Mar. 31, 2025         $ 6             $ 58             $ 181,890             $ (175,787)             $ 6,167