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Condensed Statements of Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Operating expenses:        
General and administrative $ 1,051 $ 658 $ 2,101 $ 1,133
Research and development 789 952 1,965 1,158
Acquired in-process research and development       908
Total operating expenses 1,840 1,610 4,066 3,199
Loss from operations (1,840) (1,610) (4,066) (3,199)
Interest income (expense) 449   576 (690)
Other expense   (1) (4) (1)
Net loss (1,391) (1,611) (3,494) (3,890)
Comprehensive loss (1,391) (1,611) (3,494) (3,890)
Net loss (1,391) (1,611) (3,494) (3,890)
Adjustment to redemption value on Series A convertible preferred stock (150) (149) (299) (2,666)
Net loss attributable to common stockholders $ (1,541) $ (1,760) $ (3,793) $ (6,556)
Net loss per share:        
Basic and diluted (Note 10) $ (0.42) $ (0.60) $ (1.07) $ (2.59)
Number of shares used in per share calculations:        
Basic and diluted 3,626,825 2,952,578 3,547,795 2,533,665