Stock-based Compensation (Summary of Stock Option Activity) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Stock-based Compensation [Abstract]
Shares, Balance Beginning	136,463
Assumed in the Merger (in shares)	52,602
Shares, Granted	1,207,208
Shares, Forfeited	(120,893)
Shares, Balance Ending	1,275,380	136,463
Shares, Vested or expected to vest at December 31, 2019	1,275,380
Shares, Exercisable at December 31, 2019	147,097
Weighted Average Exercise Price, Outstanding Beginning	$ 36.31
Assumed in the Merger (in dollars per share)	56.60
Weighted Average Exercise Price, Granted	3.18
Weighted Average Exercise Price, Forfeited	15.83
Weighted Average Exercise Price, Outstanding Ending	7.61	$ 36.31
Weighted Average Exercise Price, Vested or expected to vest at December 31, 2019	7.61
Weighted Average Exercise Price, Exercisable at December 31, 2019	$ 40.54
Average Remaining Contractual Term (Years), Outstanding	8 years 9 months 22 days	5 years 7 days
Average Remaining Contractual Term (Years), Vested or expected to vest at December 31, 2019	8 years 9 months 22 days
Average Remaining Contractual Term (Years), Exercisable at December 31, 2019	4 years 4 months 2 days
Intrinsic Value, granted	$ 1,569,000
Intrinsic Value, forfeited	92,000
Intrinsic Value, Outstanding Ending	1,476,000
Intrinsic Value, Vested or expected to vest at December 31, 2019	$ 1,476,000