Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
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	2,243,750	2,243,750
Series A Convertible preferred stock, shares outstanding	2,243,750	2,243,750
Series A Convertible preferred stock, aggregate liquidation preference (in dollars)	$ 8,975,000	$ 8,975,000
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	56,191,389	55,680,999
Common stock, shares outstanding	52,585,503	55,177,899
Treasury stock, shares	3,605,886	503,100