Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Patient receivables, net of allowances - Current	$ 951	$ 1,019
Patient receivables, net of allowances - Non-current	$ 592	$ 634
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares issued	25,291,637	25,291,637
Common stock, shares outstanding	19,240,820	19,050,504
Treasury stock, shares	6,050,817	6,241,133