Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 2,718	$ 2,757
Stockholders' deficit:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	19,708,494	19,289,489
Common stock, shares outstanding	19,048,326	18,990,290
Series B-1 Preferred stock
Mezzanine equity:
Preferred stock, Series B-1 Senior Convertible, par value (in dollars per share)	$ 10.00	$ 10.00
Preferred stock, Series B-1 Senior Convertible, shares authorized	2,500,000	2,500,000
Preferred stock, Series B-1 Senior Convertible, shares issued	368,782	351,444
Preferred stock, Series B-1 Senior Convertible, shares outstanding	368,782	351,444