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Fair Value Measurements - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Assets:    
Available-for-sale securities $ 126,570 $ 158,186
Short-term investments 126,570 158,186
U.S. government securities    
Assets:    
Available-for-sale securities 126,029 157,656
Certificates of deposit    
Assets:    
Available-for-sale securities 541 530
Fair value measured on recurring basis | U.S. government securities    
Assets:    
Available-for-sale securities 126,029 157,656
Fair value measured on recurring basis | Convertible promissory note    
Assets:    
Available-for-sale securities 6,020 2,330
Fair value measured on recurring basis | Certificates of deposit    
Assets:    
Short-term investments 541 530
Fair value measured on recurring basis | Embedded derivatives    
Assets:    
Derivative assets 3,020 4,628
Fair value measured on recurring basis | Commodity swap contracts    
Liabilities:    
Derivative liabilities   1,875
Fair value measured on recurring basis | Level 1 | U.S. government securities    
Assets:    
Available-for-sale securities 126,029 157,656
Fair value measured on recurring basis | Level 1 | Convertible promissory note    
Assets:    
Available-for-sale securities 0 0
Fair value measured on recurring basis | Level 1 | Certificates of deposit    
Assets:    
Short-term investments 0 0
Fair value measured on recurring basis | Level 1 | Embedded derivatives    
Assets:    
Derivative assets 0 0
Fair value measured on recurring basis | Level 1 | Commodity swap contracts    
Liabilities:    
Derivative liabilities   0
Fair value measured on recurring basis | Level 2 | U.S. government securities    
Assets:    
Available-for-sale securities 0 0
Fair value measured on recurring basis | Level 2 | Convertible promissory note    
Assets:    
Available-for-sale securities 0 0
Fair value measured on recurring basis | Level 2 | Certificates of deposit    
Assets:    
Short-term investments 541 530
Fair value measured on recurring basis | Level 2 | Embedded derivatives    
Assets:    
Derivative assets 0 0
Fair value measured on recurring basis | Level 2 | Commodity swap contracts    
Liabilities:    
Derivative liabilities   0
Fair value measured on recurring basis | Level 3 | U.S. government securities    
Assets:    
Available-for-sale securities 0 0
Fair value measured on recurring basis | Level 3 | Convertible promissory note    
Assets:    
Available-for-sale securities 6,020 2,330
Fair value measured on recurring basis | Level 3 | Certificates of deposit    
Assets:    
Short-term investments 0 0
Fair value measured on recurring basis | Level 3 | Embedded derivatives    
Assets:    
Derivative assets $ 3,020 4,628
Fair value measured on recurring basis | Level 3 | Commodity swap contracts    
Liabilities:    
Derivative liabilities   $ 1,875