Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net loss	$ (16,797)	$ (13,775)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation	198	190
Amortization of debt discount and issuance costs	679	637
Interest expense added to loan principal	6,065	5,659
Compensation charge for stock and share option awards	721	545
Changes in operating assets and liabilities:
Increase in accounts receivable	(44)	(239)
Increase in prepaid expenses and other	(147)	(201)
Increase in other assets	(214)	(214)
Increase (decrease) in accounts payable	253	(249)
Decrease in accrued liabilities	(147)	(842)
Net cash used for operating activities	(9,433)	(8,489)
Cash flows from investing activities:
Additions to property, plant and equipment	(351)	(25)
Net cash used for investing activities	(351)	(25)
Cash flows from financing activities:
Principal payments on long-term debt	(27)	(8)
Net cash used for financing activities	(27)	(8)
Net decrease in cash and cash equivalents	(9,811)	(8,522)
Cash and cash equivalents, beginning of period	16,206	11,887
Cash and cash equivalents, end of period	$ 6,395	$ 3,365