Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss and comprehensive loss	$ (8,795)	$ (4,842)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation	73	61
Amortization of debt discount and issuance costs	1,949	222
Interest expense added to loan principal	2,182	$ 1,971
Loss on early extinguishment of debt	2,250
Compensation charge for stock and share option awards	165	$ 260
Changes in operating assets and liabilities:
Decrease in accounts receivable	149	170
Increase in prepaid expenses and other	(253)	(478)
Increase in other assets	(271)	(272)
Increase in accounts payable	195	315
Increase (decrease) in accrued liabilities	876	(43)
Net cash used for operating activities	$ (1,480)	(2,636)
Cash flows from investing activities:
Additions to property, plant and equipment		(19)
Net cash used for investing activities		$ (19)
Cash flows from financing activities:
Up-front payment related to lease liability	$ 11,509
Debt Issuance costs	(102)
Principal payments on long-term debt	(10,514)	$ (3)
Net cash provided by (used for) financing activities	893	(3)
Net decrease in cash and cash equivalents	(587)	(2,658)
Cash and cash equivalents, beginning of period	2,690	16,206
Cash and cash equivalents, end of period	$ 2,103	$ 13,548