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Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating expenses:    
Research and development $ 5,397 $ 1,924
General and administrative 1,029 290
Total operating expenses 6,426 2,214
Loss from operations (6,426) (2,214)
Change in fair value of convertible preferred stock liability   300
Interest income 79 1
Net loss $ (6,347) $ (1,913)
Net loss per share, basic and diluted (in dollars per share) $ (5.39) $ (6.44)
Shares used to compute net loss per share, basic and diluted (in shares) 1,176,546 297,123
Other comprehensive income (loss):    
Unrealized gain on marketable securities $ 74  
Total other comprehensive income (loss) 74  
Comprehensive loss $ (6,273) $ (1,913)