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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Public offering
Common Stock
Private Placement
Common Stock
Participation Right
Common Stock
Additional Paid-in Capital
Public offering
Additional Paid-in Capital
Private Placement
Warrants
Additional Paid-in Capital
Private Placement
Prefunded Warrants
Additional Paid-in Capital
Private Placement
Additional Paid-in Capital
Participation Right
Warrants
Additional Paid-in Capital
Participation Right
Prefunded Warrants
Additional Paid-in Capital
Participation Right
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Public offering
Private Placement
Warrants
Private Placement
Prefunded Warrants
Private Placement
Participation Right
Warrants
Participation Right
Prefunded Warrants
Participation Right
Total
Beginning Balance at Dec. 31, 2023       $ 4               $ 98,922 $ (17) $ (93,717)               $ 5,192
Beginning Balances (in shares) at Dec. 31, 2023       38,687                                    
Share-based compensation                       67                   67
Share-based compensation (in shares)       67                                    
Fair value of stock issued in payment of accrued compensation                       326                   326
Fair value of stock issued in payment of accrued compensation (in shares)       307                                    
Shares issued for services                       3                   3
Shares issued for services (per share) (in shares)       4                                    
Foreign-exchange translation adjustment                         (3)                 (3)
Tax withholdings related to share-based compensation                       (16)                   (16)
Tax withholdings related to share-based compensation (in shares)       (22)                                    
Net loss                           (1,108)               (1,108)
Ending Balance at Mar. 31, 2024       $ 4               99,302 (20) (94,825)               4,461
Ending Balances (in shares) at Mar. 31, 2024       39,043                                    
Beginning Balance at Dec. 31, 2023       $ 4               98,922 (17) (93,717)               5,192
Beginning Balances (in shares) at Dec. 31, 2023       38,687                                    
Fair value of stock issued in payment of accrued compensation                                           $ 326
Fair value of stock issued in payment of accrued compensation (in shares)                                           307
Net loss                                           $ (2,980)
Ending Balance at Jun. 30, 2024       $ 5               112,602 (21) (96,697)               15,889
Ending Balances (in shares) at Jun. 30, 2024       50,206                                    
Beginning Balance at Mar. 31, 2024       $ 4               99,302 (20) (94,825)               4,461
Beginning Balances (in shares) at Mar. 31, 2024       39,043                                    
Share-based compensation                       344                   344
Share-based compensation (in shares)       256                                    
Shares issued for services                       3                   3
Shares issued for services (per share) (in shares)       4                                    
Issuance of common stock in offering, net of expenses $ 1       $ 2,390     $ 865     $ 1,447       $ 2,391     $ 865     $ 1,447  
Issuance of common stock in offering, net of expenses (in shares) 5,314 2,250 3,350                                      
Issuance of warrants in offering, net of expenses           $ 2,389 $ 1,214   $ 2,250 $ 580   1,831       $ 2,389 $ 1,214   $ 2,250 $ 580   1,831
Foreign-exchange translation adjustment                         (1)                 (1)
Tax withholdings related to share-based compensation                       (13)                   (13)
Tax withholdings related to share-based compensation (in shares)       (11)                                    
Net loss                           (1,872)               (1,872)
Ending Balance at Jun. 30, 2024       $ 5               112,602 (21) (96,697)               15,889
Ending Balances (in shares) at Jun. 30, 2024       50,206                                    
Beginning Balance at Dec. 31, 2024       $ 5               112,796 (21) (99,016)               13,764
Beginning Balances (in shares) at Dec. 31, 2024       50,286                                    
Share-based compensation, net of tax withholdings                       45                   45
Share-based compensation, net of tax withholdings (in shares)       81                                    
Fair value of stock issued in payment of accrued compensation                       279                   279
Fair value of stock issued in payment of accrued compensation (in shares)       326                                    
Shares issued for services                       4                   4
Shares issued for services (per share) (in shares)       4                                    
Exercise of warrants                       24                   24
Exercise of warrants (in shares)       23                                    
Exercise of prefunded warrants (in shares)       1,703                                    
Net loss                           (2,076)               (2,076)
Ending Balance at Mar. 31, 2025       $ 5               113,148 (21) (101,092)               12,040
Ending Balances (in shares) at Mar. 31, 2025       52,423                                    
Beginning Balance at Dec. 31, 2024       $ 5               112,796 (21) (99,016)               13,764
Beginning Balances (in shares) at Dec. 31, 2024       50,286                                    
Fair value of stock issued in payment of accrued compensation                                           $ 279
Fair value of stock issued in payment of accrued compensation (in shares)                                           326
Net loss                                           $ (3,756)
Ending Balance at Jun. 30, 2025       $ 5               113,202 (21) (102,772)               10,414
Ending Balances (in shares) at Jun. 30, 2025       52,426                                    
Beginning Balance at Mar. 31, 2025       $ 5               113,148 (21) (101,092)               12,040
Beginning Balances (in shares) at Mar. 31, 2025       52,423                                    
Share-based compensation, net of tax withholdings                       51                   51
Shares issued for services                       3                   3
Shares issued for services (per share) (in shares)       3                                    
Net loss                           (1,680)               (1,680)
Ending Balance at Jun. 30, 2025       $ 5               $ 113,202 $ (21) $ (102,772)               $ 10,414
Ending Balances (in shares) at Jun. 30, 2025       52,426