Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 27,129	$ 31,653
Short-term investments	1,984	2,804
Patient receivables, net of allowances of $855 and $1,019, respectively	3,061	2,810
Other accounts receivable, net	666	443
Prepaid expenses and other	2,473	3,318
Total current assets	35,313	41,028
Property and equipment, net	7,289	6,380
Patient receivables, net of allowances of $552 and $634, respectively	1,170	1,059
Other assets	223	501
Total assets	43,995	48,968
Liabilities and Stockholders' Investment
Accounts payable	6,461	8,046
Accrued liabilities and other	7,099	11,930
Debt obligations maturing within one year	751
Total current liabilities	14,311	19,976
Long-term insurance reserves, less current portion	5,651	5,741
Long-term debt obligations, less current portion	1,245	0
Other long-term liabilities	2,308	3,454
Stockholders' investment
Common stock ($.001 par value; 25,291,637 shares issued and 19,247,765 and 19,050,504 shares outstanding, respectively)	25	25
Contributed capital	180,500	179,543
Common stock in treasury, at cost (6,043,872 shares and 6,241,133 shares, respectively)	(110,063)	(111,395)
Accumulated deficit	(50,509)	(49,053)
Accumulated other comprehensive income	527	677
Total stockholders' investment	20,480	19,797
Total liabilities and stockholders' investment	$ 43,995	$ 48,968