Condensed Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net loss	$ (2,556)	$ (4,764)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	22	31
Amortization	0	179
Change in fair value of derivative instruments	(5,694)	(5,075)
Non-cash interest expense	5,156	4,091
Non-cash compensation expense	233	220
Changes in assets and liabilities excluding non-cash transactions:
Decrease (increase) in accounts receivable	19	(21)
Decrease in inventory	0	2
Decrease in prepaid expenses and other current assets	46	13
Increase in deferred revenue	19	43
Decrease in accounts payable and accrued expenses	(55)	(2,408)
(Decrease) increase in other current liabilities	(26)	6
Decrease in deferred lease liability	(4)	(30)
Decrease in restructuring accrual	0	(300)
Total adjustments	(284)	(3,249)
Net cash used in operating activities	(2,840)	(8,013)
Cash flows provided by financing activities:
Exercise of warrants	0	236
Proceeds from the issuance of common stock	0	7,174
Exercise of options	0	6
Net cash provided by financing activities	0	7,416
Net decrease in cash and cash equivalents	(2,840)	(597)
Cash and cash equivalents, beginning of period	3,069	5,326
Cash and cash equivalents, end of period	229	4,729
Schedule of non-cash financing activities
Reclassification of derivative liability to equity upon exercise of warrants	$ 0	$ 349