Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Condensed Consolidated Balance Sheets
Accounts receivable, allowances (in dollars)	$ 100,000	$ 100,000
Series A Convertible preferred stock, shares authorized	10,000,000	10,000,000
Series A Convertible preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Series A Convertible preferred stock, shares issued	1,535,398	1,535,398
Series A Convertible preferred stock, shares outstanding	1,535,398	1,535,398
Series A Convertible preferred stock, aggregate liquidation preference (in dollars)	$ 6,141,592	$ 6,141,592
Common stock, shares authorized	250,000,000	250,000,000
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued	60,232,922	59,666,333
Common stock, shares outstanding	49,857,568	49,290,979
Treasury stock, shares	10,375,354	10,375,354