Stock-based Compensation (Summary of Stock Option Activity) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Stock-based Compensation
Shares, Balance Beginning	1,668,926
Shares, Granted	856,150
Shares, Exercised	(99,517)
Shares, Forfeited/Cancelled	(15,877)
Shares, Balance Ending	2,409,682	1,668,926
Vested and expected to vest at December 31, 2021	2,409,682
Exercisable at December 31, 2021	829,624
Weighted Average Exercise Price, Outstanding Beginning	$ 6.30
Weighted Average Exercise Price, Granted	4.77
Weighted Average Exercise Price, Exercised	3.24
Weighted Average Exercise Price, Forfeited/Cancelled	42.20
Weighted Average Exercise Price, Outstanding Ending	5.64	$ 6.30
Weighted Average Exercise Price, Vested or expected to vest at Exercisable at December 31, 2021	5.64
Weighted Average Exercise Price, Exercisable at Exercisable at December 31, 2021	$ 8.67
Weighted Average Remaining Contractual Term (Years), Outstanding	8 years	8 years 3 months 25 days
Weighted Average Remaining Contractual Term (Years), Vested or expected to vest at Exercisable at December 31, 2021	8 years
Weighted Average Remaining Contractual Term (Years), Exercisable at Exercisable at December 31, 2021	6 years 10 months 24 days
Aggregate Intrinsic Value, Exercised	$ 121,000
Aggregate Intrinsic Value, Outstanding Ending	3,630,000
Aggregate Intrinsic Value, Vested or expected to vest at Exercisable at December 31, 2021	3,630,000
Aggregate Intrinsic Value, Exercisable at Exercisable at December 31, 2021	$ 1,564,000