Net Loss per Common Share (Schedule of Diluted Weighted Average Shares Outstanding) (Details) - shares	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from the computations of diluted weighted average shares outstanding	21,955,984	18,759,552
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from the computations of diluted weighted average shares outstanding	4,522,654	2,784,037
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from the computations of diluted weighted average shares outstanding	828,490	1,210,502
Unvested Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from the computations of diluted weighted average shares outstanding	16,389,156	14,306,355
Unvested Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from the computations of diluted weighted average shares outstanding	215,684	458,658