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Shareholders' Equity (Shareholders' Equity) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 16, 2020
Dec. 16, 2020
Dec. 15, 2020
Dec. 15, 2020
Dec. 14, 2020
Dec. 07, 2020
Jun. 05, 2020
Dec. 31, 2020
Dec. 31, 2019
Stockholders' Equity Note [Abstract]                  
Preferred stock, shares authorized               50,000,000 50,000,000
Preferred stock, par value               $ 0.001 $ 0.001
Preferred stock, shares issued               0 0
Common stock, shares authorized               250,000,000 250,000,000
Common stock, par value             $ 0.001 $ 0.001 $ 0.001
Subsidiary, Sale of Stock [Line Items]                  
Common stock, par value             $ 0.001 $ 0.001 $ 0.001
Common stock, shares reserved for future issuance               19,683,333  
2006 Plan, number of shares available for grant               1,566,811  
Equity Offering, Excluding Underwriter's Option                  
Subsidiary, Sale of Stock [Line Items]                  
Stock issued in transaction (shares)         4,900,000        
Underwriter's Option                  
Subsidiary, Sale of Stock [Line Items]                  
Stock issued in transaction (shares) 735,000                
Sale of stock, agreement term 30 days                
Equity Offering                  
Subsidiary, Sale of Stock [Line Items]                  
Stock issued in transaction (shares)   5,635,000              
Sale of stock, price per share (USD per share) $ 2.45 $ 2.45              
Net proceeds from transaction   $ 12,743              
Private Placement                  
Subsidiary, Sale of Stock [Line Items]                  
Stock issued in transaction (shares)     2,475,712     724,288      
Sale of stock, price per share (USD per share)     $ 2.071 $ 2.071   $ 2.071      
Net proceeds from transaction       $ 6,210          
At the Market Offering                  
Subsidiary, Sale of Stock [Line Items]                  
Stock issued in transaction (shares)               1,747,466  
Net proceeds from transaction               $ 4,429  
Maximum aggregate offering price             $ 25,000    
Commissions and fees             3.00%