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Equity (Issuance Activity Under the SEDA) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 21, 2021
Dec. 31, 2021
Private Placement, Shares Sold | Lincoln Park    
Class of Stock [Line Items]    
Common shares issued/sold (in shares)   766,000
Private Placement, Additional Commitment Shares | Lincoln Park    
Class of Stock [Line Items]    
Common shares issued/sold (in shares)   15,000
Private Placement | Lincoln Park    
Class of Stock [Line Items]    
Common shares issued/sold (in shares) 15,000 781,000
Proceeds received   $ 4,217
Private Placement | YA    
Class of Stock [Line Items]    
Common shares issued/sold (in shares)   1,700,000
Proceeds received   $ 10,000
May 2021 Equity Distribution Agreement    
Class of Stock [Line Items]    
Common shares issued/sold (in shares)   8,339,000
Gross proceeds received   $ 50,000
Commissions   500
Proceeds received   $ 49,500
July 2021 Equity Distribution Agreements    
Class of Stock [Line Items]    
Common shares issued/sold (in shares)   4,712,000
Gross proceeds received   $ 24,020
Commissions   240
Proceeds received   $ 23,780