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Common Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2023
Jul. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2023
Class of Warrant or Right [Line Items]            
Common shares issued for extinguishment of debt (in shares)     18,144,158   1,547,234  
Streeterville Capital, LLC | Exchange Agreement            
Class of Warrant or Right [Line Items]            
Common shares issued for extinguishment of debt (in shares)       7,349,420   26,429,554
Notes reduction       $ 2.0    
Additional Paid-in Capital            
Class of Warrant or Right [Line Items]            
Common shares issued for extinguishment of debt     $ 3.2   $ 1.4  
September 2021 Warrants            
Class of Warrant or Right [Line Items]            
Common shares issued for extinguishment of debt (in shares) 232,675          
Shares issued for cash / offering (in shares) 76,794       324,918  
March 2022 Warrants            
Class of Warrant or Right [Line Items]            
Common shares issued for extinguishment of debt (in shares) 751,867          
Shares issued for cash / offering (in shares) 248,124       324,918  
ATM            
Class of Warrant or Right [Line Items]            
Shares issued for cash / offering (in shares)     41,393,825 19,326,522 9,655,207  
Sale of stock, consideration received on transaction     $ 6.4 $ 5.6 $ 15.4  
Sale of stock, consideration received, net of offering cost     $ 6.1 $ 5.4 $ 15.0  
ATM | Minimum            
Class of Warrant or Right [Line Items]            
Share price (in usd per share)     $ 0.139609 $ 0.200034 $ 1.15 $ 0.139609
ATM | Maximum            
Class of Warrant or Right [Line Items]            
Share price (in usd per share)     0.22291 $ 0.54 1.86 0.22291
Registered Direct Offering | Warrants            
Class of Warrant or Right [Line Items]            
Exercise price of warrants (in usd per share)         $ 0.001  
Registered Direct Offering | Pre-Funded Warrants            
Class of Warrant or Right [Line Items]            
Shares issued for cash / offering (in shares)         1,380,000  
Registered Direct Offering | Pre-Funded Warrants | Warrants            
Class of Warrant or Right [Line Items]            
Warrants exercised for common shares (in shares)         1,380,000  
May 2023 Offering | Warrants            
Class of Warrant or Right [Line Items]            
Exercise price of warrants (in usd per share)   $ 0.26 $ 0.26     $ 0.26
May 2023 Offering | Pre-Funded Warrants            
Class of Warrant or Right [Line Items]            
Shares issued for cash / offering (in shares)   9,000,000 9,000,000      
May 2023 Offering | Pre-Funded Warrants | Warrants            
Class of Warrant or Right [Line Items]            
Warrants exercised for common shares (in shares)   9,000,000 9,000,000     9,000,000