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CONDENSED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues:        
License fees and royalties $ 208 $ 174 $ 526 $ 711
Operating expenses:        
Research and development 3,204 2,499 5,644 5,873
General and administrative 4,246 4,406 9,561 9,063
Total operating expenses 7,450 6,905 15,205 14,936
Loss from operations (7,242) (6,731) (14,679) (14,225)
Interest and other income 717 346 1,111 678
Change in fair value of equity investment (350)   (475)  
Other expense (59) (20) (77) (41)
Net loss $ (6,934) $ (6,405) $ (14,120) $ (13,588)
Basic and diluted net loss per share $ (0.04) $ (0.04) $ (0.08) $ (0.09)
Shares used in computing basic and diluted net loss per share 174,475,244 159,182,367 167,538,530 159,171,959