Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 18,568	$ 19,350
Short-term investments	25,311	31,947
Patient receivables, net of allowances of $1,035 and $1,392	2,366	2,256
Other accounts receivable, net	1,974	1,867
Prepaid expenses and other	4,254	5,641
Total current assets	52,473	61,061
Property and equipment	70,760	72,286
Accumulated depreciation and amortization	(60,123)	(57,322)
Property and equipment, net	10,637	14,964
Long-term investments	902	951
Patient receivables, net of allowances of $634 and $330	769	413
Other assets	1,652	3,092
Total assets	66,433	80,481
Liabilities and Stockholders' Investment
Accounts payable	8,103	8,110
Accrued liabilities and other	12,175	11,615
Deferred revenue	2,516	4,376
Debt obligations maturing within one year	2,978	3,039
Total current liabilities	25,772	27,140
Other long-term liabilities	4,443	4,995
Long-term debt obligations, less current portion	1,026	4,245
Long-term insurance reserves, less current portion	6,264	6,430
Deferred license fee	1,703	3,065
Deferred revenue	960	3,476
Stockholders' Investment
Common stock ($.001 par value; 25,291,637 shares issued and 18,858,147 and 18,711,365 shares outstanding, respectively)	25	25
Contributed capital	177,287	175,610
Common stock in treasury, at cost (6,433,490 shares and 6,580,272 shares, respectively)	(112,910)	(114,033)
Retained deficit	(38,720)	(31,134)
Accumulated other comprehensive income	583	662
Total stockholders' investment	26,265	31,130
Total liabilities and stockholders' investment	$ 66,433	$ 80,481