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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 ($)
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: