Consolidated Statements of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net loss	$ (5,900)	$ (10,633)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property and equipment	322	295
Amortization of patent and trademark rights, and royalty interest	161	57
Redeemable warrants valuation adjustment	(1,558)	(341)
Equity based compensation	348	659
Other than temporary impairment of marketable securities	258	0
Change in assets and liabilities:
Inventories	(302)	(212)
Prepaid expenses and other current assets	(93)	97
Other assets	0	(6)
Accounts payable	319	763
Accrued expenses	(629)	(749)
Net cash used in operating activities	(7,074)	(10,070)
Cash flows from investing activities:
Purchase of property and equipment	(849)	(514)
Additions to patent and trademark rights	(92)	(201)
Deposits on capital leases	(4)	(9)
Maturities of short-term and long-term investments	11,148	4,356
Purchase of short-term and long-term investments	(3,133)	(48,856)
Net cash provided by (used in) investing activities	7,070	(45,224)
Cash flows from financing activities:
Payments on capital lease	(50)	(27)
Proceeds from Margin Account Loan	1,156	0
Proceeds from sale of stock, net of issuance costs	0	293
Net cash provided by financing activities	1,106	266
Net increase (decrease) in cash and cash equivalents	1,102	(55,028)
Cash and cash equivalents at beginning of period	2,920	58,072
Cash and cash equivalents at end of period	4,022	3,044
Supplemental disclosures of non-cash investing and financing cash flow information:
Issuance of common stock for accounts payable and accrued expenses	71	328
Equipment acquired by capital lease	62	200
Unrealized gain in investments	107	717
Redeemable warrants valuation adjustment	(1,558)	(341)
Supplemental disclosure of cash flow information:
Cash paid for interest expense	$ 21	$ 5