Stock-Based Compensation (Schedule of Non-vested Share Activity) (Details)	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-vested [Roll Forward]
Non-vested stock options, Number of Shares, Period Start | shares	845,555
Vested, Number of Shares | shares	(199,931)
Cancelled, Number of Shares | shares	(117,471)
Non-vested stock options, Number of Shares, Period End | shares	528,153
Share-based Compensation Arrangement by Share-based Payment Award, Options, Non-vested, Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested stock options, Weighted Average Fair Value, Period Start | $ / shares	$ 10.88
Vested, Weighted Average Fair Value | $ / shares	8.76
Cancelled, Weighted Average Fair Value | $ / shares	11.62
Non-vested stock options, Weighted Average Fair Value, Period End | $ / shares	$ 11.52