Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Patient receivables, net of allowances - Current	$ 1,034	$ 1,035
Patient receivables, net of allowances - Non-current	$ 705	$ 634
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares issued	25,291,637	25,291,637
Common stock, shares outstanding	19,024,305	18,858,147
Treasury stock, shares	6,267,332	6,433,490