Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating expenses:    
Research and development $ 13,025 $ 6,970
General and administrative 3,457 2,070
Total operating expenses 16,482 9,040
Loss from operations (16,482) (9,040)
Interest income 352 108
Other expense, net (3) (2)
Net loss (16,133) (8,934)
Other comprehensive loss    
Unrealized loss on marketable securities, net of tax (34)  
Comprehensive loss $ (16,167) $ (8,934)
Net loss per share, basic and diluted $ (4.69) $ (2.90)
Weighted average number of shares used in computing net loss per share, basic and diluted 3,437,345 3,079,551