Equity Incentive Plans (Summary of Stock Option Activity) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Stock-based Compensation
Shares, Balance Beginning	1,668,926
Shares, Granted	549,750
Shares, Exercised	(46,134)
Shares, Forfeited/Cancelled	(5,599)
Shares, Balance Ending	2,166,943	1,668,926
Vested and expected to vest at December 31, 2020	2,166,943
Exercisable at September 30, 2020	435,646
Weighted Average Exercise Price, Outstanding Beginning	$ 6.30
Weighted Average Exercise Price, Granted	5.14
Weighted Average Exercise Price, Exercised	3.34
Weighted Average Exercise Price, Forfeited/Cancelled	94.92
Weighted Average Exercise Price, Outstanding Ending	5.84	$ 6.30
Weighted Average Exercise Price, Vested or expected to vest at September 30, 2020	5.84
Weighted Average Exercise Price, Exercisable at September 30, 2020	$ 13.83
Weighted Average Remaining Contractual Term (Years), Outstanding	8 years 6 months 22 days	8 years 3 months 26 days
Weighted Average Remaining Contractual Term (Years), Vested or expected to vest at September 30, 2020	8 years 6 months 22 days
Weighted Average Remaining Contractual Term (Years), Exercisable at September 30, 2020	6 years 7 months 6 days
Aggregate Intrinsic Value, Exercised	$ 82,000
Aggregate Intrinsic Value, Outstanding Ending	2,311,000
Aggregate Intrinsic Value, Vested or expected to vest at September 30, 2020	2,311,000
Aggregate Intrinsic Value, Exercisable at September 30, 2020	$ 452,000