Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Net loss	$ (9,032)	$ (7,982)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation	188	181
Amortization of debt discount and issuance costs	1,425	1,157
Interest expense added to loan principal	1,733	1,563
Unrealized gain on derivative liability		(56)
Compensation charge for stock and share options	232	1,793
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(27)	253
Increase in prepaid expenses and other	(910)	(437)
Decrease (increase) in other assets	31	(83)
(Decrease) increase in accounts payable	(832)	507
Increase (decrease) in accrued liabilities	575	(210)
Increase in deferred revenue	553	500
Net cash used for operating activities	(6,064)	(2,814)
Cash flows from investing activities:
Additions to property, plant and equipment	(858)	(2,109)
Increase in restricted cash	(428)
Net cash used for investing activities	(1,286)	(2,109)
Cash flows from financing activities:
Proceeds from issuance of long-term debt		2,000
Principal payments on long-term debt	(4)	(8)
Net cash (used for) provided by financing activities	(4)	1,992
Net decrease in cash and cash equivalents	(7,354)	(2,931)
Cash and cash equivalents, beginning of period	11,370	5,911
Cash and cash equivalents, end of period	$ 4,016	$ 2,980