Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net loss	$ (3,358)	$ (2,424)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	4	2
Change in fair value of derivative instruments	1,266	(340)
Non-cash interest expense	1,441	1,116
Non-cash compensation expense	43	35
Loss on disposal of fixed assets		10
Changes in assets and liabilities excluding non-cash transactions:
Increase in accounts receivable		(1)
Decrease (increase) in prepaid expenses and other current assets	7	(11)
Increase in deferred revenue		2
(Decrease) increase in accounts payable and accrued expenses	(507)	211
(Decrease) increase in other current liabilities	(31)	11
(Decrease) increase in deferred lease liability	(2)
Total adjustments	2,221	1,035
Net cash used in operating activities	(1,137)	(1,389)
Cash flows from investing activities:
Purchase of fixed assets		(32)
Net cash used in investing activities		(32)
Net decrease in cash and cash equivalents	(1,137)	(1,421)
Cash and cash equivalents, beginning of period	4,053	1,484
Cash and cash equivalents, end of period	$ 2,916	$ 63