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Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Operating expenses        
Research and development $ 8,838 $ 3,591 $ 14,561 $ 7,233
General and administrative 2,976 1,499 5,713 3,404
Total operating expenses 11,814 5,090 20,274 10,637
Loss from operations (11,814) (5,090) (20,274) (10,637)
Interest income 431 76 911 124
Interest expense (includes $1,005 and $1,867 attributable to related parties for the three and six months ended June 30, 2018, respectively) (2) (1,877) (6) (3,347)
Other income (expense), net (includes $191 and $1,585 other expense attributable to related parties for the three and six months ended June 30, 2018, respectively) 0 (518) 0 (2,469)
Net loss $ (11,385) $ (7,409) $ (19,369) $ (16,329)
Net loss per common share, basic and diluted $ (0.31) $ (0.96) $ (0.52) $ (2.11)
Weighted-average common shares outstanding used in computing net loss per common share, basic and diluted 37,294,853 7,757,081 37,271,638 7,720,967
Other comprehensive income        
Change in unrealized gains related to available-for-sale debt securities, net of tax $ 6 $ 0 $ 12 $ 0
Total other comprehensive income 6 0 12 0
Comprehensive loss $ (11,379) $ (7,409) $ (19,357) $ (16,329)