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Stockholders' Equity (Summary of Nonvested Options) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Options
Nonvested at beginning of period			2,825,652
Options granted			1,436,929
Options vested			(1,223,108)
Options forfeited			(155,784)
Nonvested at end of period	2,883,689		2,883,689
Weighted-Average Grant Date Fair Value
Nonvested at beginning of period (in dollars per share)			$ 6.50
Options granted (in dollars per share)	$ 8.00	$ 8.64	7.62	$ 5.50
Options vested (in dollars per share)			6.67
Options forfeited (in dollars per share)			6.98
Nonvested at end of period (in dollars per share)	$ 6.96		$ 6.96
Employee Consultant And Directors Stock Options
Weighted-Average Grant Date Fair Value
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 14.1		$ 14.1
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 7 months 6 days

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