Common Stock - Summary of Reserved Shares of Common Stock for Issuance (Details) - shares shares in Thousands	Jun. 30, 2025	Dec. 31, 2024
Common Stock
Shares of authorized but unissued common stock	62,274	52,184
Options issued and outstanding
Common Stock
Shares of authorized but unissued common stock	348	535
Unvested RSUs
Common Stock
Shares of authorized but unissued common stock	1,071	1,214
Vested and unreleased RSUs
Common Stock
Shares of authorized but unissued common stock	110
Shares available for future grant from 2024 plan
Common Stock
Shares of authorized but unissued common stock	2,862	3,062
Shares available for future grant from 2024 ESPP
Common Stock
Shares of authorized but unissued common stock	600	600
Common stock warrants
Common Stock
Shares of authorized but unissued common stock	36,783	26,273
Legacy GCT Earnout Shares
Common Stock
Shares of authorized but unissued common stock	20,000	20,000
Convertible promissory notes
Common Stock
Shares of authorized but unissued common stock	500	500