Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net loss	$ (24,013,000)	$ (18,881,000)	$ (22,677,000)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation	270,000	254,000	254,000
Amortization of deferred loan costs	198,000	226,000	223,000
Amortization of debt discount	1,635,000	633,000	1,352,000
Interest expense added to loan principal	$ 8,237,000	$ 7,659,000	6,069,000
Loss on early extinguishment of debt and debt refinancing			835,000
Compensation charge for stock awards and share options	$ 1,116,000	$ 1,077,000	516,000
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	52,000	52,000	(31,000)
Decrease in prepaid expenses and other	37,000	4,000	54,000
Increase in other assets	(186,000)	(186,000)	(2,744,000)
Increase (decrease) in accounts payable	9,000	(533,000)	43,000
Increase (decrease) in accrued liabilities	77,000	(426,000)	339,000
Net cash used for operating activities	(12,568,000)	(10,121,000)	(15,767,000)
Cash flows from investing activities:
Additions to property, plant and equipment	(906,000)	(72,000)	(167,000)
Net cash used for investing activities	$ (906,000)	(72,000)	$ (167,000)
Cash flows from financing activities:
Net proceeds from issuance of common stock		$ 14,523,000
Net proceeds from issuance of long-term debt			$ 27,390,000
Debt issuance costs			(1,243,000)
Principal payments on long-term debt	$ (42,000)	$ (11,000)	(11,000)
Net cash (used for) provided by financing activities	(42,000)	14,512,000	26,136,000
Net (decrease) increase in cash and cash equivalents	(13,516,000)	4,319,000	10,202,000
Cash and cash equivalents, beginning of period	16,206,000	11,887,000	1,685,000
Cash and cash equivalents, end of period	$ 2,690,000	$ 16,206,000	$ 11,887,000