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Acquisition of 3dent Technologies, LLC - Schedule of Fair Value Consideration Paid on Acquisition (Details) - 3Dent Acquisition [Member] $ in Thousands | Feb. 01, 2021 USD ($)
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Fair value of base purchase price | $ 1,452
Less discount for lack of marketability | (290)
Adjusted fair value | $ 1,162

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- Definition Adjusted fair value. + References No definition available. + Details
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Namespace Prefix: | OPTT_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Discount for lack of marketability. + References No definition available. + Details
Name: | OPTT_DiscountForLackOfMarketability
Namespace Prefix: | OPTT_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value of base purchase price. + References No definition available. + Details
Name: | OPTT_FairValueOfBasePurchasePrice
Namespace Prefix: | OPTT_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=OPTT_ThreeDentAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |