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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Operating expenses:        
In-process research and development $ 10,000 $ 0 $ 10,000 $ 0
Research and development 562 8,492 10,739 37,621
General and administrative 10,707 11,941 33,837 36,681
Restructuring and impairment charges 2,362 46,283 7,146 71,847
Total operating expenses 23,631 66,716 61,722 146,149
Loss from operations (23,631) (66,716) (61,722) (146,149)
Interest income 1,654 2,313 5,635 6,671
Interest expense (2,007) (2,003) (5,988) (3,229)
Other rental income 1,493 0 1,493 0
Other expense, net (530) (1,026) (1,658) (455)
Net loss (23,021) (67,432) (62,240) (143,162)
Other comprehensive loss:        
Foreign currency translation (291) 231 (252) (210)
Unrealized gain on available-for-sale securities, net 398 39 80 178
Net comprehensive loss $ (22,914) $ (67,162) $ (62,412) $ (143,194)
Net loss per share, basic (in dollars per share) $ (3.54) $ (10.37) $ (9.57) $ (22.01)
Net loss per share, diluted (in dollars per share) $ (3.54) $ (10.37) $ (9.57) $ (22.01)
Weighted-average shares used in computing net loss per share, basic (in shares) 6,506,681 6,503,913 6,504,842 6,503,913
Weighted-average shares used in computing net loss per share, diluted (in shares) 6,506,681 6,503,913 6,504,842 6,503,913