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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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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