Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 3,103	$ 2,920
Marketable securities- unrestricted	26,229	32,689
Marketable securities- restricted	1,026	0
Inventories	897	787
Prepaid expenses and other current assets	531	278
Total current assets	31,786	36,674
Property and equipment, net	5,276	4,876
Patent and trademark rights, net	863	794
Marketable securities- unrestricted	1,958	8,778
Marketable securities - restricted	2,075	0
Construction in progress	1,484	485
Other assets	71	73
Total assets	43,513	51,680
Current liabilities:
Accounts payable	1,681	1,328
Accrued expenses	1,644	1,443
Margin Account Loan	1,695	0
Current portion of capital lease	49	61
Total current liabilities	5,069	2,832
Long-term liabilities:
Long-term portion of capital lease	99	96
Redeemable warrants	380	2,805
Total liabilities	5,548	5,733
Commitments and contingencies (Notes 11, 13, 14, 20 & 21)
Stockholders' equity:
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 350,000,000 shares in 2011, and 200,000,000 in 2010; issued and outstanding 135,642,303 and 135,241,609, respectively	136	135
Additional paid-in capital	264,958	264,511
Unrealized loss	(389)	(974)
Accumulated deficit	(226,740)	(217,725)
Total stockholders' equity	37,965	45,947
Total liabilities and stockholders' equity	$ 43,513	$ 51,680