Net Loss per Common Share (Tables)

6 Months Ended

Jun. 30, 2016

Net Loss per Common Share [Abstract]

Anti-dilutive Securities Excluded from Diluted Loss per Common Share

We calculate basic net loss per common share amounts by dividing net loss by the weighted-average common shares outstanding, excluding outstanding shares contingently subject to forfeiture.  For calculating diluted net loss per common share amounts, we add additional shares to the weighted-average common shares outstanding for the assumed exercise of stock options and vesting of restricted shares, if dilutive.  Because we had a net loss during the six months ended June 30, 2016 and 2015 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
June 30, 2016		2,814,000	$	0.88 to $24.40
June 30, 2015		3,767,000	$	1.64 to $24.40