Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 3,363	$ 5,040
Prepaids and other current assets	40	60
Total current assets	3,403	5,100
Total assets	3,403	5,100
Current liabilities:
Accounts payable	68	8
Accrued expenses	128	240
Accrued payroll and related expenses	18	7
Derivative liabilities	12,717	15,270
Total current liabilities	12,931	15,525
Series C-12 redeemable convertible preferred stock, $0.0001 par value; 11,000 shares authorized, 5,386 and 5,043 shares issued and outstanding at September 30, 2012 and December 31, 2011, respectively (redemption value and liquidation preference in the aggregate of $ 5,667 at September 30, 2012 and $5,116 at December 31, 2011)	5,800	5,133
Commitments and contingencies
Stockholders' deficit:
Common stock	5
Preferred stock	3,595
Additional paid-in capital	425,333	424,071
Accumulated deficit	(444,261)	(439,629)
Total stockholders' deficit	(15,328)	(15,558)
Total liabilities, redeemable convertible preferred stock and stockholders' deficit	$ 3,403	$ 5,100