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Condensed Balance Sheets (Current Period Unaudited) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Current assets:    
Cash $ 105,012 $ 72,287
Prepaid expenses and other current assets 518 638
Total current assets 105,530 72,925
Property and equipment, net 2,978 2,882
Other long-term assets 130 130
Total assets 108,638 75,937
Current liabilities:    
Accounts payable 1,769 1,264
Accrued clinical liabilities 3,705 1,773
Accrued payroll and employee-related liabilities 1,835 2,566
Other accrued expenses 2,177 364
Convertible notes payable to related parties, net of discount 1,306 1,025
Total current liabilities 10,792 6,992
Stockholders’ equity:    
Common stock 289 237
Additional paid-in capital 372,976 307,578
Accumulated deficit (275,419) (238,870)
Total stockholders’ equity 97,846 68,945
Total liabilities and stockholders’ equity $ 108,638 $ 75,937