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Equity and Stock-Based Compensation (Issuance Activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 21, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Private Placement, Shares Sold | Lincoln Park          
Class of Stock [Line Items]          
Common shares issued/sold (in shares)   766,000   766,000  
Private Placement, Additional Commitment Shares | Lincoln Park          
Class of Stock [Line Items]          
Common shares issued/sold (in shares)   15,000   15,000  
Private Placement | Lincoln Park          
Class of Stock [Line Items]          
Common shares issued/sold (in shares) 15,000 781,000   781,000  
Net proceeds   $ 4,217   $ 4,217  
Equity Distribution Agreements          
Class of Stock [Line Items]          
Common shares issued/sold (in shares)   5,972,000   5,972,000  
Gross proceeds received   $ 36,579   $ 36,579  
Commissions and other expenses   366   366  
Net proceeds   $ 36,213   $ 36,213  
Common Stock          
Class of Stock [Line Items]          
Common shares issued/sold (in shares)   706,000 0 2,711,000 0
Gross proceeds received   $ 4,292 $ 0 $ 16,119 $ 0
Commissions and other expenses   54 0 202 0
Net proceeds   $ 4,238 $ 0 $ 15,917 $ 0