Condensed Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 19,867	$ 19,350
Short-term investments	30,436	31,947
Patient receivables, net of allowances of $1,223 and $1,392, respectively	2,382	2,256
Other accounts receivable, net	1,606	1,867
Prepaid expenses and other	4,748	5,641
Total current assets	59,039	61,061
Property and equipment	73,009	72,286
Accumulated depreciation and amortization	(60,177)	(57,322)
Property and equipment, net	12,832	14,964
Long-term investments	954	951
Patient receivables, net of allowances of $542 and $330, respectively	566	413
Other assets	2,187	3,092
Total assets	75,578	80,481
Liabilities and Stockholders' Investment
Accounts payable	7,357	8,110
Accrued liabilities and other	13,956	12,266
Deferred revenue	3,457	4,376
Debt obligations maturing within one year	3,004	3,039
Total current liabilities	27,774	27,791
Long-term rent obligations and other	2,871	3,368
Long-term debt obligations, less current portion	2,583	4,245
Insurance reserves	7,135	7,406
Deferred license fee	2,213	3,065
Deferred revenue	1,989	3,476
Stockholders' investment
Common stock ($.001 par value; 25,291,637 shares issued and 18,837,847 and 18,711,365 shares outstanding, respectively)	25	25
Contributed capital	176,437	175,610
Common stock in treasury, at cost (6,453,790 shares and 6,580,272 shares, respectively)	(113,062)	(114,033)
Retained deficit	(33,115)	(31,134)
Accumulated other comprehensive income	728	662
Total stockholders' investment	31,013	31,130
Total liabilities and stockholders' investment	$ 75,578	$ 80,481