Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 4,381	$ 5,040	[1]
Prepaids and other current assets	50	60	[1]
Total current assets	4,431	5,100	[1]
Total assets	4,431	5,100	[1]
Current liabilities:
Accounts payable	36	8	[1]
Accrued expenses	212	240	[1]
Accrued payroll and related expenses	7	7	[1]
Derivative liabilities	9,417	15,270	[1]
Total current liabilities	9,672	15,525	[1]
Series C-12 redeemable convertible preferred stock, $0.0001 par value; 11,000 shares authorized, 5,023 and 5,043 shares issued and outstanding at March 31, 2012 and December 31, 2011, respectively (redemption value and liquidation preference in the aggregate of $5,282 at March 31, 2012 and $5,116 at December 31, 2011)	5,336	5,133	[1]
Commitments and contingencies
Stockholders' deficit:
Common stock	4	0
Preferred stock	3,607	0
Additional paid-in capital	420,156	424,071	[1]
Accumulated deficit	(434,344)	(439,629)	[1]
Total stockholders' deficit	(10,577)	(15,558)	[1]
Total liabilities, redeemable convertible preferred stock and stockholders' deficit	$ 4,431	$ 5,100	[1]

[1] The condensed consolidated balance sheet at December 31, 2011 has been derived from the audited consolidated financial statements as of that date but does not include all of the information and disclosures required by U.S. generally accepted accounting principles (see Note 1)