Net Income (Loss) per Common Share (Tables)

3 Months Ended

Mar. 31, 2017

Net Income (Loss) per Common Share [Abstract]

Anti-dilutive Securities Excluded from Diluted Loss per Common Share

Because we had a net loss during the three months ended March 31, 2017 and 2016, the following options and warrants and outstanding and unvested restricted stock to purchase shares of our common stock were excluded from diluted net loss per common share because of their anti-dilutive effect, and therefore, basic net loss per common share equals dilutive net loss per common share:

	Number of options, warrants and unvested restricted stock		Range of stock option and warrant exercise prices
Three months ended March 31, 2017		2,244,000		$0.88 to $24.40
Three months ended March 31, 2016		2,662,000		$1.20 to $24.40