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Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Operating expenses:        
Research and development $ 3,384 $ 4,683 $ 11,589 $ 12,584
General and administrative 1,940 1,556 6,119 3,618
Total operating expenses 5,324 6,239 17,708 16,202
Other income (expense):        
Interest income 97 8 272 8
Loss on disposal of assets (138) 0 (138) 0
Total other income (expense) (41) 8 134 8
Net loss (5,365) (6,231) (17,574) (16,194)
Less: Accretion and dividends on convertible preferred stock 0 (1,554) 0 (4,217)
Net loss attributable to common stockholders—basic and diluted (5,365) (7,785) (17,574) (20,411)
Other comprehensive loss:        
Unrealized loss on available for sale securities, net of tax (14) 0 (8) 0
Total other comprehensive loss $ (5,379) $ (7,785) $ (17,582) $ (20,411)
Net loss per share attributable to common stockholders—basic and diluted (in USD per share) $ (0.26) $ (82.16) $ (0.84) $ (222.70)
Common shares used to compute basic and diluted net loss per share attributable to common stockholders (in shares) 20,835,868 94,753 20,832,727 91,650