Balance Sheet Components - Additional Information (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Balance Sheet Components [Line Items] | ||||
| Depreciation expense | $ 40,000 | $ 600,000 | $ 712,000 | $ 1,165,000 |
| Impairment charge in restructuring, impairment and costs of suspended programs | 2,163,000 | $ 0 | $ 10,197,000 | $ 0 |
| Long-lived assets held-for-sale, description | Pursuant to the amendment to transfer of its lease in San Carlos to the tenant executed in June 2025 (see Note 5), the Company agreed to assign certain items of property and equipment located within the leased premises in San Carlos to the new tenant free of charge. As a result, the Company concluded its remaining property and equipment met the definition of “held for sale” as of June 30, 2025 and impaired the carrying amount of the assets to their fair value of zero except for $0.5 million of assets expected to be sold to a third party in the third quarter of 2025 | |||
| Assets expected to be sold to a third party for which value not written down to zero | 479,000 | $ 479,000 | ||
| Assets Except Expected to be Sold to Third Party | ||||
| Balance Sheet Components [Line Items] | ||||
| Fair value | $ 0 | $ 0 | ||