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Condensed Balance Sheets (Current Period Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash $ 57,475 $ 72,287
Prepaid expenses and other current assets 2,262 638
Total current assets 59,737 72,925
Property and equipment, net 2,926 2,882
Other long-term assets 130 130
Total assets 62,793 75,937
Current liabilities:    
Accounts payable 3,603 1,264
Accrued expenses 2,617 4,703
Convertible notes payable to related parties, net of discount 1,164 1,025
Total current liabilities 7,384 6,992
Stockholders’ equity:    
Common stock 239 237
Additional paid-in capital 311,578 307,578
Accumulated deficit (256,408) (238,870)
Total stockholders’ equity 55,409 68,945
Total liabilities and stockholders’ equity $ 62,793 $ 75,937