Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
OPERATING EXPENSES:    
Research and development $ 62,570 $ 61,788
General and administrative 43,048 32,678
Total operating expenses 105,618 94,466
LOSS FROM OPERATIONS (105,618) (94,466)
OTHER INCOME (EXPENSE), NET:    
Interest income (expense), net 555 559
Other income (expense) (521) (54)
Total other income (expense), net 34 505
Net loss (105,584) (93,961)
Net loss attributable to common stockholders-basic (105,584) (93,961)
Net loss attributable to common stockholders-diluted $ (105,584) $ (93,961)
Net loss per share attributable to common stockholders-basic $ (4.12) $ (4.28)
Net loss per share attributable to common stockholders-diluted $ (4.12) $ (4.28)
Weighted-average common stock outstanding-basic 25,598,181 21,966,326
Weighted-average common stock outstanding-diluted 25,598,181 21,966,326