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Commitments and Contingencies - Purchase Commitment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Feb. 29, 2024
Purchase Commitment          
Research and development expense $ 5,521 $ 902 $ 10,712 $ 17,385  
Unpaid recorded expenses included in accounts payable 1,242   17,814 19,017  
Research and development agreement with Samsung          
Purchase Commitment          
Outstanding purchase commitments 0   0 500  
Total fee amount 21,100   21,100    
Fee amount to be paid over development milestones 11,700   11,700    
Additional NRE to be paid as fee amount $ 9,400   $ 9,400    
Period for payment of additional NRE 4 years   4 years    
Gain on release of unconditional liability $ 14,600        
Research and development expense     $ 400 7,100  
Unpaid recorded expenses included in accounts payable     15,800 $ 15,400  
Aggregated unpaid amount     $ 17,100    
Research And Development Agreement With Alpha Holdings Co., Ltd          
Purchase Commitment          
Total fee amount         $ 7,600
Research and development expense 3,500        
Aggregated unpaid amount $ 5,000