Net Loss per Common Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Amounts Excluded from Calculation of Diluted Weighted-Average Shares Outstanding

The amounts in the table below were excluded from the calculation of diluted weighted-average shares outstanding, prior to the use of the treasury stock method, due to their anti-dilutive effect:

	March 31,
	2020		2019
Warrants		7,984,650		20,718
Unvested restricted stock units		49,773		178,225
Outstanding stock options		148,254		365,789
Totals		8,182,677		564,732