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Fair Value Measurements - Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Available-for-sale securities $ 51,319 $ 127,970
Short-term investments 51,319 127,970
U.S. government securities    
Assets:    
Available-for-sale securities 50,767 127,429
Certificates of deposit    
Assets:    
Available-for-sale securities 552 541
Fair value measured on recurring basis | U.S. government securities    
Assets:    
Available-for-sale securities 50,767 127,429
Fair value measured on recurring basis | Convertible promissory notes    
Assets:    
Available-for-sale securities 524 2,372
Fair value measured on recurring basis | Certificates of deposit    
Assets:    
Short-term investments 552 541
Fair value measured on recurring basis | Embedded derivatives    
Assets:    
Derivative assets 1,201 2,621
Fair value measured on recurring basis | Level 1 | U.S. government securities    
Assets:    
Available-for-sale securities 50,767 127,429
Fair value measured on recurring basis | Level 1 | Convertible promissory notes    
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 2 | U.S. government securities    
Assets:    
Available-for-sale securities 0 0
Fair value measured on recurring basis | Level 2 | Convertible promissory notes    
Assets:    
Available-for-sale securities 0 0
Fair value measured on recurring basis | Level 2 | Certificates of deposit    
Assets:    
Short-term investments 552 541
Fair value measured on recurring basis | Level 2 | Embedded derivatives    
Assets:    
Derivative assets 0 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 notes    
Assets:    
Available-for-sale securities 524 2,372
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 $ 1,201 $ 2,621