Equity Incentive Plans (Summary of Stock Option Activity) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Equity Incentive Plans
Shares, Balance Beginning	2,409,682
Shares, Forfeited/Cancelled	(103,343)
Shares, Balance Ending	2,306,339	2,409,682
Vested and expected to vest at March 31, 2022	2,306,339
Exercisable at March 31, 2022	952,421
Weighted Average Exercise Price, Outstanding Beginning	$ 5.64
Weighted Average Exercise Price, Forfeited/Cancelled	9.50
Weighted Average Exercise Price, Outstanding Ending	5.47	$ 5.64
Weighted Average Exercise Price, Vested and expected to vest at March 31, 2022	5.47
Weighted Average Exercise Price, Exercisable at March 31, 2022	$ 7.70
Weighted Average Remaining Contractual Term (Years), Outstanding	7 years 9 months 18 days	8 years
Weighted Average Remaining Contractual Term (Years), Vested and expected to vest at March 31, 2022	7 years 9 months 18 days
Weighted Average Remaining Contractual Term (Years), Exercisable at March 31, 2022	7 years 29 days
Aggregate Intrinsic Value, Outstanding Ending	$ 2,598,000
Aggregate Intrinsic Value, Vested and expected to vest at March 31, 2022	2,598,000
Aggregate Intrinsic Value, Exercisable at March 31, 2022	$ 1,173,000