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Equity and Stock-Based Compensation (Issuance Activity) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 21, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Private Placement, Shares Sold | Lincoln Park          
Class of Stock [Line Items]          
Common shares issued/sold (in shares)   0   766,000  
Private Placement, Additional Commitment Shares | Lincoln Park          
Class of Stock [Line Items]          
Common shares issued/sold (in shares)   0   15,000  
Private Placement | Lincoln Park          
Class of Stock [Line Items]          
Common shares issued/sold (in shares) 15,000 0   781,000  
Net proceeds   $ 0   $ 4,217  
May 2021 Equity Distribution Agreement          
Class of Stock [Line Items]          
Common shares issued/sold (in shares)   2,367,000   8,339,000  
Gross proceeds received   $ 13,421   $ 50,000  
Commissions and other expenses   134   500  
Net proceeds   $ 13,287   $ 49,500  
July 2021 Equity Distribution Agreements          
Class of Stock [Line Items]          
Common shares issued/sold (in shares)   4,183,000   4,183,000  
Gross proceeds received   $ 21,363   $ 21,363  
Commissions and other expenses   214   214  
Net proceeds   $ 21,149   $ 21,149  
Common Stock          
Class of Stock [Line Items]          
Common shares issued/sold (in shares)   0 3,046,000 2,711,000 3,046,000
Gross proceeds received   $ 0 $ 7,715 $ 16,119 $ 7,715
Commissions and other expenses   0 97 202 97
Net proceeds   $ 0 $ 7,618 $ 15,917 $ 7,618