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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Accounting Policies [Abstract] |  |
Cash, cash equivalents, and restricted cash, FDIC insured amount | $ 172.1 | $ 184.8
Cash, cash equivalents, and restricted cash, uninsured amount | $ 13.6 | $ 7.0
Threshold period past due | 90 days |

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- Definition Cash, Cash Equivalents, And Restricted Cash, FDIC Insured Amount + References No definition available. + Details
Name: | oust_CashCashEquivalentsAndRestrictedCashFDICInsuredAmount
Namespace Prefix: | oust_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash, Cash Equivalents, And Restricted Cash, Uninsured Amount + References No definition available. + Details
Name: | oust_CashCashEquivalentsAndRestrictedCashUninsuredAmount
Namespace Prefix: | oust_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Threshold period past due for trade accounts receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_ThresholdPeriodPastDueForWriteoffOfTradeAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration