Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Condensed Consolidated Balance Sheets
Accounts receivable, allowances (in dollars)	$ 100,000
Series A Convertible preferred stock, shares authorized	10,000,000
Series A Convertible preferred stock, par value (in dollars per share)	$ 0.01
Series A Convertible preferred stock, shares outstanding	1,535,398	2,243,750
Series A Convertible preferred stock, aggregate liquidation preference (in dollars)	$ 6,141,592	$ 8,975,000
Common stock, shares authorized	250,000,000
Common stock par value (in dollars per share)	$ 0.01
Common stock, shares issued	59,666,333	56,191,389
Common stock, shares outstanding	49,290,979	52,585,503
Treasury stock, shares	10,375,354	3,605,886