Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 3,806	$ 5,040
Prepaids and other current assets	97	60
Total current assets	3,903	5,100
Total assets	3,903	5,100
Current liabilities:
Accounts payable	129	8
Accrued expenses	89	240
Accrued payroll and related expenses	12	7
Derivative liabilities	13,806	15,270
Total current liabilities	14,036	15,525
Series C-12 redeemable convertible preferred stock, $0.0001 par value; 11,000 shares authorized,5,392 and 5,043 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively (redemption value and liquidation preference in the aggregate of $ 5,468 at June 30, 2012 and $5,116 at December 31, 2011)	5,560	5,133
Commitments and contingencies
Stockholders' deficit:
Common stock	5
Preferred stock	3,595
Additional paid-in capital	422,747	424,071
Accumulated deficit	(442,040)	(439,629)
Total stockholders' deficit	(15,693)	(15,558)
Total liabilities, redeemable convertible preferred stock and stockholders' deficit	$ 3,903	$ 5,100