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v3.25.3

Condensed Statements of Changes in Convertible Preferred Stock and Stockholders’ Deficit (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025
Temporary equity, stock issuance costs |  | $ 52 | $ 352
IPO |  |  |
Stock issuance costs | $ 5,538 |  |

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- Definition Temporary Equity, Stock Issuance Costs + References No definition available. + Details
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Namespace Prefix: | si_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |