Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net loss	$ (16,837)	$ (15,899)	$ (14,399)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation	365	344	342
Amortization of deferred loan costs	72	42	56
Amortization of debt discount	2,372	1,918	1,937
Interest added to loan principal	3,261	2,782	2,356
Unrealized (gain) loss on derivative liability	(108)	110
Compensation charge for stock awards and share options	2,376	4,009	2,273
Issuance of stock for services			500
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	138	(102)	(109)
(Increase) decrease in prepaid expenses and other	(305)	63	145
Decrease in other assets	63	220	194
Increase (decrease) in accounts payable	304	(141)	252
Increase (decrease) in accrued liabilities	285	(107)	(30)
Increase in tax liability			105
Increase in deferred revenue	500
Net cash used for operating activities	(7,514)	(6,761)	(6,378)
Cash flows from investing activities:
Additions to property, plant and equipment	(4,140)	(1,184)	(119)
Proceeds from sale of marketable securities			4,500
Net cash (used for) provided by investing activities	(4,140)	(1,184)	4,381
Cash flows from financing activities:
Net proceeds from issuance of common stock	15,129		8,835
Proceeds from issuance of long-term debt	2,000	5,000	46
Principal payments on long-term debt	(16)	(22)	(20)
Net cash provided by financing activities	17,113	4,978	8,861
Net increase (decrease) in cash and cash equivalents	5,459	(2,967)	6,864
Cash and cash equivalents, beginning of period	5,911	8,878	2,014
Cash and cash equivalents, end of period	$ 11,370	$ 5,911	$ 8,878