Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net loss	$ (18,881,000)	$ (22,677,000)	$ (19,574,000)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation	254,000	254,000	350,000
Amortization of deferred loan costs	226,000	223,000	108,000
Amortization of debt discount	633,000	1,352,000	3,123,000
Interest expense added to loan principal	7,659,000	6,069,000	3,589,000
Loss on early extinguishment of debt and debt refinancing		835,000
Compensation charge for stock awards and share options	1,077,000	516,000	383,000
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	52,000	(31,000)	(121,000)
Decrease in prepaid expenses and other	4,000	54,000	200,000
Increase in other assets	(186,000)	(2,744,000)	(109,000)
(Decrease) increase in accounts payable	(533,000)	43,000	128,000
(Decrease) increase in accrued liabilities	(426,000)	339,000	273,000
Increase in deferred revenue			250,000
Net cash used for operating activities	(10,121,000)	(15,767,000)	(11,400,000)
Cash flows from investing activities:
Additions to property, plant and equipment	(72,000)	(167,000)	(3,226,000)
Increase in other assets (restricted cash)			(63,000)
Net cash used for investing activities	(72,000)	(167,000)	(3,289,000)
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	5,014,000
Debt issuance costs		(1,243,000)
Principal payments on long-term debt	(11,000)	(11,000)	(10,000)
Net cash provided by financing activities	14,512,000	26,136,000	5,004,000
Net increase (decrease) in cash and cash equivalents	4,319,000	10,202,000	(9,685,000)
Cash and cash equivalents, beginning of period	11,887,000	1,685,000	11,370,000
Cash and cash equivalents, end of period	$ 16,206,000	$ 11,887,000	$ 1,685,000