Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Condensed Consolidated Balance Sheets
Accounts receivable, allowances (in dollars)	$ 200,000	$ 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	56,525,013	56,191,389
Common stock, shares outstanding	51,633,574	52,585,503
Treasury stock, shares	4,891,439	3,605,886