CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 11,456	$ 77,348
Marketable securities	3,001	119,391
Other current assets	1,290	1,904
Total current assets	15,747	198,643
Property and equipment, net	902	1,138
Total assets	16,649	199,781
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	596	776
Accrued expenses and other current liabilities	2,004	5,688
Notes payable	0	115,849
Total current liabilities	2,600	122,313
Total liabilities	2,600	122,313
Commitments and contingencies
Stockholders’ equity:
Preferred stock - $0.01 par value, authorized 3,000,000 shares; no shares issued and outstanding at June 30, 2013 and December 31, 2012	0	0
Common stock - $0.01 par value, authorized 170,000,000 shares; issued and outstanding 43,731,646 shares at June 30, 2013 and 43,674,170 shares at December 31, 2012	437	437
Additional paid-in capital	154,354	224,796
Accumulated other comprehensive income	(3)	83
Accumulated deficit	(140,739)	(147,848)
Total stockholders’ equity	14,049	77,468
Total liabilities and stockholders’ equity	$ 16,649	$ 199,781