Restatement of previously issued financial statements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 2,678	$ 3,443	$ 3,342	$ 3,704
Accounts receivable	0	9
Prepaid expenses and other current assets	233	340
Total current assets	2,911	3,792
Non-current assets:
Restricted cash	2,039	2,039
Property and equipment, at cost, net	21	25
Intangible assets, net of accumulated amortization of $118 (as revised)	1,743	1,795
Total assets	6,714	7,651
Liabilities
Accounts payable	203	242
Accrued expenses	177	272
Other payables	21	67
Total current liabilities	401	581
Non-current liabilities:
Derivative liability - warrants	5,044	7,166
Total liabilities	5,445	7,747
Redeemable convertible preferred stock - temporary equity
Preferred Stock, Series A Convertible Preferred, $0.001 par value; 1,394,766 shares authorized; 1,394,766 shares issued and outstanding at December 31, 2012 ($4,547 Liquidation preference)		47
Stockholders' equity/(deficit)
Preferred Stock, Value		0
Common stock, $0.001 par value; 75,000,000 shares authorized; 3,522,935 and 3,251,187 shares issued and outstanding at March 31, 2013, and December 2012 respectively	4	3
Additional paid in capital	283,296	282,998
Accumulated other comprehensive loss	(281)	(281)
Accumulated deficit	(282,570)	(283,631)
Total stockholders' equity/(deficit)	449	(911)
Non-controlling interests	712	768
Total equity	1,161	(143)
Total stockholders' equity/(deficit), liabilities and non-controlling interest	6,714	7,651
Scenario, Previously Reported [Member]
Assets
Cash and cash equivalents		3,443
Accounts receivable		9
Prepaid expenses and other current assets		340
Total current assets		3,792
Non-current assets:
Restricted cash		2,039
Property and equipment, at cost, net		25
Intangible assets, net of accumulated amortization of $118 (as revised)		1,704
Total assets		7,560
Liabilities
Accounts payable		242
Accrued expenses		196
Other payables		67
Total current liabilities		505
Non-current liabilities:
Derivative liability - warrants		0
Total liabilities		505
Redeemable convertible preferred stock - temporary equity
Preferred Stock, Series A Convertible Preferred, $0.001 par value; 1,394,766 shares authorized; 1,394,766 shares issued and outstanding at December 31, 2012 ($4,547 Liquidation preference)		0
Stockholders' equity/(deficit)
Preferred Stock, Value		1
Common stock, $0.001 par value; 75,000,000 shares authorized; 3,522,935 and 3,251,187 shares issued and outstanding at March 31, 2013, and December 2012 respectively		3
Additional paid in capital		295,050
Accumulated other comprehensive loss		(281)
Accumulated deficit		(288,447)
Total stockholders' equity/(deficit)		6,326
Non-controlling interests		729
Total equity		7,055
Total stockholders' equity/(deficit), liabilities and non-controlling interest		7,560
Restatement Adjustment [Member]
Assets
Cash and cash equivalents		0
Accounts receivable		0
Prepaid expenses and other current assets		0
Total current assets		0
Non-current assets:
Restricted cash		0
Property and equipment, at cost, net		0
Intangible assets, net of accumulated amortization of $118 (as revised)		91
Total assets		91
Liabilities
Accounts payable		0
Accrued expenses		76
Other payables		0
Total current liabilities		76
Non-current liabilities:
Derivative liability - warrants		7,166
Total liabilities		7,242
Redeemable convertible preferred stock - temporary equity
Preferred Stock, Series A Convertible Preferred, $0.001 par value; 1,394,766 shares authorized; 1,394,766 shares issued and outstanding at December 31, 2012 ($4,547 Liquidation preference)		47
Stockholders' equity/(deficit)
Preferred Stock, Value		(1)
Common stock, $0.001 par value; 75,000,000 shares authorized; 3,522,935 and 3,251,187 shares issued and outstanding at March 31, 2013, and December 2012 respectively		0
Additional paid in capital		(12,052)
Accumulated other comprehensive loss		0
Accumulated deficit		4,816
Total stockholders' equity/(deficit)		(7,237)
Non-controlling interests		39
Total equity		(7,198)
Total stockholders' equity/(deficit), liabilities and non-controlling interest		$ 91