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Certain Balance Sheet Accounts - Summary of Changes In Accrued Warranty (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Movement in Standard Product Warranty Accrual [Roll Forward] |  |  |  |
Accrued warranty, beginning of period | $ 725 | $ 922 | $ 661 | $ 924
Provision for warranties issued during the period | 193 | 262 | 394 | 504
Settlements of warranty claims during the period | (143) | (192) | (280) | (436)
Accrued warranty, end of period | $ 775 | $ 992 | $ 775 | $ 992

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- Definition Provision for warranties issued during the period + References No definition available. + Details
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Namespace Prefix: | owlt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Settlements of warranty claims during the period + References No definition available. + Details
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Namespace Prefix: | owlt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInStandardProductWarrantyAccrualRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI https://asc.fasb.org/extlink&oid=126907703&loc=d3e12565-110249 + Details
Name: | us-gaap_StandardProductWarrantyAccrual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant