Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 31,653	$ 18,568
Short-term investments	2,804	25,311
Patient receivables, net of allowances of $1,019 and $1,035	2,810	2,366
Other accounts receivable, net	443	1,974
Prepaid expenses and other	3,318	4,254
Total current assets	41,028	52,473
Property and equipment	64,964	70,760
Accumulated depreciation	(58,584)	(60,123)
Property and equipment, net	6,380	10,637
Long-term investments		902
Patient receivables, net of allowances of $634 and $634	1,059	769
Other assets	501	1,652
Total assets	48,968	66,433
Current liabilities
Accounts payable	8,046	8,103
Accrued liabilities and other	11,060	12,175
Deferred revenue	870	2,516
Debt obligations maturing within one year		2,978
Total current liabilities	19,976	25,772
Other long-term liabilities	3,023	4,443
Long-term debt obligations, less current portion		1,026
Long-term insurance reserves, less current portion	5,741	6,264
Deferred license fee	341	1,703
Deferred revenue	90	960
Stockholders' investment
Common stock ($.001 par value; 25,291,637 shares issued and 19,050,504 and 18,858,147 shares outstanding, respectively)	25	25
Contributed capital	179,543	177,287
Common stock in treasury, at cost (6,241,133 shares and 6,433,490 shares, respectively)	(111,395)	(112,910)
Accumulated deficit	(49,053)	(38,720)
Accumulated other comprehensive income	677	583
Total stockholders' investment	19,797	26,265
Total liabilities and stockholders' investment	$ 48,968	$ 66,433