XML 63 R52.htm IDEA: XBRL DOCUMENT v3.20.2

Warrants (Details Narrative) - $ / shares	Apr. 08, 2019	Jul. 22, 2016	Jun. 02, 2016	Oct. 31, 2020
Pre-funded Warrants [Member]
Warrant to purchase shares common stock	3,385,680
Warrant exercise price per share	$ 0.01
Securities Purchase Agreement [Member]
Number of common stock shares sold	1,542,000		20,850
Warrant to purchase shares common stock	4,927,680		7,298
Warrant exercise price per share	$ 3.85		$ 121.60
Class of warrant or right, expiration period	5 years		5 years
Number of exercised warrants
Second Amended Purchase Agreement [Member]
Number of common stock shares sold		29,750
Warrant to purchase shares common stock		8,925
Warrant exercise price per share		$ 187.20
Class of warrant or right, expiration period		5 years
Number of exercised warrants

X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

No definition available.

+ Details

Name:	OPTT_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantOrRights
Namespace Prefix:	OPTT_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of exercised warrants.

+ References

No definition available.

+ Details

Name:	OPTT_NumberOfExercisedWarrants
Namespace Prefix:	OPTT_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=OPTT_PreFundedWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=OPTT_SecuritiesPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=OPTT_SecondAmendedPurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: