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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Operating expenses:        
Research and development $ 2,921 $ 8,459 $ 10,177 $ 29,129
General and administrative 10,706 11,518 23,130 24,740
Restructuring and impairment charges 508 1,010 4,783 25,564
Total operating expenses 14,135 20,987 38,090 79,433
Loss from operations (14,135) (20,987) (38,090) (79,433)
Interest income 1,919 2,287 3,981 4,358
Interest expense (1,999) (590) (3,980) (1,226)
Other (expense) income, net (702) 628 (1,130) 571
Net loss (14,917) (18,662) (39,219) (75,730)
Other comprehensive loss:        
Foreign currency translation (5) (211) 39 (441)
Unrealized (loss) gain on available-for-sale securities, net (59) (178) (318) 139
Net comprehensive loss $ (14,981) $ (19,051) $ (39,498) $ (76,032)
Net loss per share, diluted (in dollars per share) $ (2.29) $ (2.87) $ (6.03) $ (11.64)
Net loss per share, basic (in dollars per share) $ (2.29) $ (2.87) $ (6.03) $ (11.64)
Weighted-average shares used in computing net loss per share, basic (in shares) 6,503,913 6,503,913 6,503,913 6,503,913
Weighted-average shares used in computing net loss per share, diluted (in shares) 6,503,913 6,503,913 6,503,913 6,503,913