Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Summary Of Unvested Shares) (Details)

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Stock-Based Compensation (Summary Of Unvested Shares) (Details) - Stock Option [Member]
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Number of Options, Granted 52,465
Nonvested Options [Member]  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Number of Options, Unvested 131,531
Number of Options, Granted 52,465
Number of Options, Vested (51,386)
Number of Options, Cancelled (51,299)
Number of Options, Unvested 81,311
Weighted Average Fair Value at Grant Date, Unvested | $ / shares $ 13.19
Weighted Average Fair Value at Grant Date, Granted | $ / shares 4.20
Weighted Average Fair Value at Grant Date, Vested | $ / shares 14.12
Weighted Average Fair Value at Grant Date, Cancelled | $ / shares 11.47
Weighted Average Fair Value at Grant Date, Unvested | $ / shares $ 7.90