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Stockholders' Equity And Stock-Based Compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Stockholders' Equity And Stock-Based Compensation [Abstract]    
Outstanding as of, Beginning 3,210,965  
Options granted 60,000  
Options exercised (71,105)  
Options forfeited/canceled (382,356)  
Outstanding as of, Ending 2,817,504 3,210,965
Vested and expected to vest at December 31, 2020 2,817,504  
Exercisable at December 31, 2020 2,167,633  
Weighted Average Exercise Price, Outstanding as of, Beginning $ 12.27  
Weighted Average Exercise Price, Options granted 7.25  
Weighted Average Exercise Price, Options exercised 3.60  
Weighted Average Exercise Price, Options forfeited/cancelled 20.31  
Weighted Average Exercise Price, Outstanding as of, Ending 11.30 $ 12.27
Weighted Average Exercise Price, Vested and expected to vest at December 31, 2020 11.30  
Weighted Average Exercise Price, Exercisable at December 31, 2020 $ 13.86  
Weighted Average Remaining Contractual Term 5 years 7 months 6 days 6 years 18 days
Weighted Average Remaining Contractual Term, Vested and expected to vest at December 31, 2020 5 years 7 months 6 days  
Weighted Average Remaining Contractual Term, Exercisable at December 31, 2020 4 years 10 months 6 days  
Outstanding, Aggregate Intrinsic Value $ 6.4 $ 4.2
Aggregate Intrinsic Value, Vested and expected to vest at December 31, 2020 6.4  
Aggregate Intrinsic Value, Exercisable at December 31, 2020 $ 3.7