Equity Incentive Plans (Summary of Stock Option Activity) (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Equity Incentive Plans [Abstract]
Shares, Balance Beginning	1,275,380
Shares, Granted	129,766
Shares, Forfeited	(39,382)
Shares, Balance Ending	1,365,764	1,275,380
Vested and expected to vest at March 31, 2020	1,365,764
Exercisable at March 31, 2020	169,558
Weighted Average Exercise Price, Outstanding Beginning	$ 7.61
Weighted Average Exercise Price, Granted	3.85
Weighted Average Exercise Price, Forfeited	8.29
Weighted Average Exercise Price, Outstanding Ending	7.08	$ 7.61
Weighted Average Exercise Price, Vested or expected to vest at March 31, 2020	7.08
Weighted Average Exercise Price, Exercisable at March 31, 2020	$ 33.83
Weighted Average Remaining Contractual Term (Years), Outstanding	8 years 5 months 23 days	8 years 9 months 22 days
Weighted Average Remaining Contractual Term (Years), Vested or expected to vest at March 31, 2020	8 years 5 months 23 days
Weighted Average Remaining Contractual Term (Years), Exercisable at March 31, 2020	3 years 3 months 7 days