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Equity - Issuance Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended 13 Months Ended
May 17, 2021
Mar. 12, 2021
Dec. 07, 2020
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Lincoln Park Capital Fund, LLC | Private Placement              
Class of Stock [Line Items]              
Shares issued (in shares)   16,000 19,000       1,000,000
Gross proceeds received             $ 25,100
Lincoln Park Capital Fund, LLC | Common Stock | Private Placement, Shares Sold | First Lincoln Park Purchase Agreement              
Class of Stock [Line Items]              
Shares issued (in shares)       205,000   836,000  
Lincoln Park Capital Fund, LLC | Common Stock | Private Placement, Shares Sold | Second Lincoln Park Purchase Agreement              
Class of Stock [Line Items]              
Shares issued (in shares)         2,050,000    
Lincoln Park Capital Fund, LLC | Common Stock | Private Placement | First Lincoln Park Purchase Agreement              
Class of Stock [Line Items]              
Shares issued (in shares)       205,000   855,000  
Gross proceeds received       $ 4,590   $ 20,556  
Lincoln Park Capital Fund, LLC | Common Stock | Private Placement | Second Lincoln Park Purchase Agreement              
Class of Stock [Line Items]              
Shares issued (in shares)         2,066,000    
Gross proceeds received         $ 43,586    
Lincoln Park Capital Fund, LLC | Common Stock | Additional commitment shares | First Lincoln Park Purchase Agreement              
Class of Stock [Line Items]              
Shares issued (in shares)       0   19,000  
Lincoln Park Capital Fund, LLC | Common Stock | Additional commitment shares | Second Lincoln Park Purchase Agreement              
Class of Stock [Line Items]              
Shares issued (in shares)         16,000    
Keystone Capital Partners, LLC | Private Placement              
Class of Stock [Line Items]              
Shares issued (in shares) 4,000            
Keystone Capital Partners, LLC | Common Stock | Private Placement, Shares Sold              
Class of Stock [Line Items]              
Shares issued (in shares)         3,062,000    
Keystone Capital Partners, LLC | Common Stock | Private Placement              
Class of Stock [Line Items]              
Shares issued (in shares)         3,066,000    
Gross proceeds received         $ 147,961    
Keystone Capital Partners, LLC | Common Stock | Additional commitment shares              
Class of Stock [Line Items]              
Shares issued (in shares)         4,000    
YA II PN, Ltd. | Common Stock | Private Placement | First YA SEDA              
Class of Stock [Line Items]              
Shares issued (in shares)         1,372,000    
Gross proceeds received         $ 40,556    
YA II PN, Ltd. | Common Stock | Private Placement | Second YA SEDA              
Class of Stock [Line Items]              
Shares issued (in shares)         3,790,000    
Gross proceeds received         $ 165,391    
Seven Knots, LLC | Common Stock | Private Placement              
Class of Stock [Line Items]              
Shares issued (in shares)         4,009,000    
Gross proceeds received         $ 81,279    
B. Riley Principal Capital, LLC | Common Stock | Private Placement              
Class of Stock [Line Items]              
Shares issued (in shares)         4,623,000    
Gross proceeds received         $ 67,989    
M3A LP | Common Stock | Private Placement              
Class of Stock [Line Items]              
Shares issued (in shares)         900,000    
Gross proceeds received         $ 12,941