Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 7,450 $ 23,059
Prepaid expenses and other 170 333
Total current assets 7,620 23,392
Property and equipment, net 468 213
Other assets 352 481
Other assets-equipment funding (Note 3(d)) 6,763 6,763
Total assets 15,203 30,849
Current liabilities:    
Current portion of long-term debt 8,222 8,412
Accounts payable 1,912 1,967
Accrued expenses 2,418 2,018
Total current liabilities 12,552 12,397
Long-term debt 1,370 5,481
Total liabilities 13,922 17,878
Stockholders' equity:    
Preferred stock, $0.001 par value. Authorized 10,000,000 shares. None issued and outstanding      
Common stock, $0.001 par value. Authorized 90,000,000 shares; issued and outstanding 14,754,819 and 14,748,582 shares at June 30, 2012 and December 31, 2011, respectively 15 15
Additional paid-in capital 116,702 115,940
Deficit accumulated during the development stage (115,436) (102,984)
Total stockholders' equity 1,281 12,971
Total liabilities and stockholders' equity $ 15,203 $ 30,849