Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents (Note 13)	$ 4,022	$ 2,920
Marketable securities - Unrestricted (Note 5)	27,702	32,689
Marketable securities - Restricted (Note 6)	1,035	0
Inventories (Note 4)	1,089	787
Prepaid expenses and other current assets	371	278
Total current assets	34,219	36,674
Property and equipment, net	4,737	4,876
Patent and trademark rights, net	725	794
Investment	0	35
Marketable securities - Unrestricted (Note 5)	2,457	8,778
Marketable securities - Restricted (Note 6)	2,107	0
Construction in progress (Note 9)	1,213	485
Other assets	77	38
Total assets	45,535	51,680
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	1,576	1,328
Accrued expenses (Note 7)	814	1,443
Margin Account Loan (Note 10)	1,156	0
Current portion of capital lease (Note 8)	57	61
Total current liabilities	3,603	2,832
Long-term liabilities
Long-term portion of capital lease (Note 8)	112	96
Redeemable warrants (Note 12)	1,247	2,805
Total liabilities	4,962	5,733
Commitments and contingencies
Stockholders' equity (Note 11):
Preferred stock, par value $0.01 per share, authorized 5,000,000; issued and outstanding; none	0	0
Common stock, par value $0.001 per share, authorized 200,000,000 shares; issued and outstanding 135,537,970 and 135,241,609, respectively	135	135
Additional paid-in capital	264,930	264,511
Accumulated other comprehensive loss	(867)	(974)
Accumulated deficit	(223,625)	(217,725)
Total stockholders' equity	40,573	45,947
Total liabilities and stockholders' equity	$ 45,535	$ 51,680