Net Loss per Common Share (Basic and Diluted Income (Loss) Per Share) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic and diluted net income (loss) per common share calculation:
Net loss	$ (3,246,000)	$ (3,112,000)
Accretion of Series B redeemable convertible preferred stock		(1,725,000)
Net loss attributable to common stockholders - basic & diluted	$ (3,246,000)	$ (4,837,000)
Weighted average number of shares of common stock outstanding - basic & diluted (in shares)	1,677,497	588,350
Net loss per share of common stock - basic & diluted	$ (1.94)	$ (8.22)