CONDENSED BALANCE SHEETS (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash	$ 1,403	$ 1,442
Investments available for sale	50,454	66,166
Accounts and other receivables	1,460	1,928
Inventory	729	510
Deferred tax asset	2,192	3,170
Prepaid expenses and other current assets	762	736
Total current assets	57,000	73,952
Property and equipment, net	2,646	3,127
Restricted cash	392	521
Other assets	19	184
Total assets	60,057	77,784
Current liabilities:
Accounts payable and accrued expenses	5,613	5,569
Deferred revenue, current portion	13,573	40,960
Total current liabilities	19,186	46,529
Deferred revenue, net of current portion		3,333
Other long-term liabilities	442	465
Total liabilities	19,628	50,327
Stockholders' equity:
Common stock, $.001 par value, 90,000 shares authorized, 32,827 shares outstanding - 2011, 32,794 shares outstanding - 2010	33	33
Additional paid-in-capital	277,749	274,646
Accumulated other comprehensive income (loss)	22	(3)
Accumulated deficit	(237,375)	(247,219)
Total stockholders' equity	40,429	27,457
Total liabilities and stockholders' equity	$ 60,057	$ 77,784