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Shareholders' Equity (Shareholders' Equity) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 05, 2020
Dec. 31, 2021
Dec. 31, 2022
Stockholders' Equity Note [Abstract]      
Preferred stock, shares authorized (in shares)   50,000,000 50,000,000
Preferred stock, par value (in usd per share)   $ 0.001 $ 0.001
Preferred stock, shares issued (in shares)   0 0
Common stock, shares authorized (in shares)   250,000,000 250,000,000
Common stock, par value (in usd per share) $ 0.001 $ 0.001 $ 0.001
Subsidiary, Sale of Stock [Line Items]      
Common stock, par value (in usd per share) $ 0.001 $ 0.001 $ 0.001
Common stock, shares reserved for future issuance     24,533,333
2006 Plan, number of shares available for grant     1,996,019
At the Market Offering      
Subsidiary, Sale of Stock [Line Items]      
Stock issued in transaction (shares)   61,018  
Net proceeds from transaction   $ 321  
Maximum aggregate offering price $ 25,000    
Commissions and fees 3.00%