Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 30,866	$ 31,653
Short-term investments		2,804
Patient receivables, net of allowances of $951 and $1,019, respectively	3,195	2,810
Other accounts receivable, net	1,627	443
Prepaid expenses and other	3,864	3,318
Total current assets	39,552	41,028
Property and equipment, net	7,447	6,380
Patient receivables, net of allowances of $592 and $634, respectively	1,301	1,059
Other assets	223	501
Total assets	48,523	48,968
Current liabilities
Accounts payable	7,848	8,046
Accrued liabilities and other	8,628	11,930
Debt obligations maturing within one year	861
Total current liabilities	17,337	19,976
Other long-term liabilities	2,468	3,454
Long-term insurance reserves, less current portion	5,655	5,741
Long-term debt obligations, less current portion	1,404
Stockholders' investment
Common stock ($.001 par value; 25,291,637 shares issued and 19,240,820 and 19,050,504 shares outstanding, respectively)	25	25
Contributed capital	180,212	179,543
Common stock in treasury, at cost (6,050,817 shares and 6,241,133 shares, respectively)	(110,093)	(111,395)
Accumulated deficit	(48,919)	(49,053)
Accumulated other comprehensive income	434	677
Total stockholders' investment	21,659	19,797
Total liabilities and stockholders' investment	$ 48,523	$ 48,968