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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Preferred Stock
Common Stock
Additional Paid-in Capital
Common Stock to be Issued
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Dec. 31, 2022     9,566 145,492,971        
Beginning balance at Dec. 31, 2022 $ 117,754   $ 9,273 $ 145 $ 294,810 $ 0 $ (186,474)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock reacquired in exchange for warrants (in shares)       (12,000,000)        
Common stock reacquired in exchange for warrants (12,491)     $ (12) (12,479)      
Warrant issuance in conjunction with debt modification 16,036       16,036      
Issuance of stock (in shares)       40,764,706        
Issuance of stock 26,309     $ 41 26,268      
Common stock to be issued, net of issuance costs 4,390         4,390    
Warrant offerings 14,991       14,991      
Stock-based compensation expense and issuance of stock (in shares)       248,049        
Stock-based compensation expense and issuance of stock 876       876      
Convertible promissory notes converted to common stock (in shares)       11,762,956        
Convertible promissory notes converted to common stock 4,705     $ 12 4,693      
Net loss (26,257)           (26,257)  
Ending balance (in shares) at Mar. 31, 2023     9,566 186,268,682        
Ending balance at Mar. 31, 2023 146,313   $ 9,273 $ 186 345,195 4,390 (212,731)  
Beginning balance (in shares) at Dec. 31, 2022     9,566 145,492,971        
Beginning balance at Dec. 31, 2022 $ 117,754   $ 9,273 $ 145 294,810 0 (186,474)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Accounting Standards Update [Extensible Enumeration] Accounting Standards Update 2023-08 [Member]              
Ending balance (in shares) at Dec. 31, 2023     9,566 276,733,329        
Ending balance at Dec. 31, 2023 $ 222,489 $ 37 $ 9,273 $ 277 472,834 0 (259,895) $ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of stock (in shares)       23,268,600        
Issuance of stock 50,650     $ 23 50,627      
Common stock issued for share based liabilities due to related party (in shares)       1,083,189        
Common stock issued for share based liabilities due to related party 2,500     $ 1 2,499      
Stock-based compensation expense and issuance of stock (in shares)       2,190,510        
Stock-based compensation expense and issuance of stock 6,931     $ 2 6,929      
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)       (353,843)        
Tax withholdings related to net share settlements of stock-based compensation awards (651)       (651)      
Net loss (9,613)           (9,613)  
Ending balance (in shares) at Mar. 31, 2024     9,566 302,921,785        
Ending balance at Mar. 31, 2024 $ 272,343   $ 9,273 $ 303 $ 532,238 $ 0 $ (269,471)