Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Allowances for receivables	$ 57	$ 24
Accumulated depreciation and amortization of equipment and leasehold improvements	16,062	14,805
Amortization of intangibles	$ 3,443	$ 3,351
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	35,000,000	35,000,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	50,000,000	50,000,000
Common Stock, shares issued	27,655,133	27,636,853
Common Stock, shares outstanding	26,594,463	25,849,876
Treasury stock, shares	1,060,670	1,786,977
Series B Convertible Preferred Stock [Member]
Preferred Stock, par value	$ 0.01	$ 0.01
Preferred Stock, shares authorized	5,000,000	5,000,000
Preferred Stock, shares issued	1,641,986	1,644,768
Preferred Stock, shares outstanding	1,641,986	1,644,768
Liquidation preference	$ 10,572	$ 10,443