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Condensed Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Operating expenses:        
Research and development $ 3,564 $ 1,969 $ 9,731 $ 5,362
General and administrative 3,688 652 8,086 2,903
Restructuring costs   1,416 116 1,416
Total operating expenses 7,252 4,037 17,817 9,681
Loss from operations (7,252) (4,037) (17,817) (9,681)
Other income (expense):        
Interest income 5   9 6
Interest expense   (64)   (151)
Gain on issuance of convertible notes       63
Change in fair value of convertible notes   (359)   (775)
Change in fair value of non-marketable equity securities (364)   (645)  
Gain on sale of PNAi technology     2,691  
Total other income (expense) (359) (423) 2,055 (857)
Net loss and comprehensive loss $ (7,611) $ (4,460) $ (15,762) $ (10,538)
Net loss per share attributable to common stockholders, basic and diluted $ (0.36) $ (13.68) $ (1.46) $ (32.64)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 21,265,519 325,985 10,793,436 322,811