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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues:    
License fees and royalties $ 318 $ 537
Operating expenses:    
Research and development 2,440 3,374
General and administrative 5,315 4,657
Total operating expenses 7,755 8,031
Loss from operations (7,437) (7,494)
Interest and other income 394 332
Change in fair value of equity investment (125)  
Interest and other expense (18) (21)
Net loss $ (7,186) $ (7,183)
Basic and diluted net loss per share $ (0.04) $ (0.05)
Shares used in computing basic and diluted net loss per share 160,525,947 159,161,550