Equity Incentive Plans (Summary of Stock Option Activity) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Stock-based Compensation
Shares, Balance Beginning	1,668,926
Shares, Granted	719,750
Shares, Exercised	(46,134)
Shares, Forfeited/Cancelled	(7,474)
Shares, Balance Ending	2,335,068	1,668,926
Vested and expected to vest at December 31, 2020	2,335,068
Exercisable at September 30, 2020	744,996
Weighted Average Exercise Price, Outstanding Beginning	$ 6.30
Weighted Average Exercise Price, Granted	4.96
Weighted Average Exercise Price, Exercised	3.34
Weighted Average Exercise Price, Forfeited/Cancelled	71.89
Weighted Average Exercise Price, Outstanding Ending	5.73	$ 6.30
Weighted Average Exercise Price, Vested or expected to vest at September 30, 2020	5.73
Weighted Average Exercise Price, Exercisable at September 30, 2020	$ 9.41
Weighted Average Remaining Contractual Term (Years), Outstanding	8 years 3 months	8 years 3 months 25 days
Weighted Average Remaining Contractual Term (Years), Vested or expected to vest at September 30, 2020	8 years 3 months
Weighted Average Remaining Contractual Term (Years), Exercisable at September 30, 2020	6 years 6 months
Aggregate Intrinsic Value, Exercised	$ 82,000
Aggregate Intrinsic Value, Outstanding Ending	1,115,000
Aggregate Intrinsic Value, Vested or expected to vest at September 30, 2020	1,115,000
Aggregate Intrinsic Value, Exercisable at September 30, 2020	$ 466,000