Development Milestone Eligibility

No definition available.

Name:	optn_DevelopmentMilestoneEligibility
Namespace Prefix:	optn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage Of Royalty

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Research and Development Arrangement, Contract to Perform for Others, Additional Revenue Eligible And Held In Escrow

+ References

No definition available.

+ Details

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Namespace Prefix:	optn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Research And Development Arrangement, Contract To Perform For Others, Milestone Payments, Maximum Eligible

+ References

No definition available.

+ Details

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Namespace Prefix:	optn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of compensation earned (contract income) under a research and development arrangement accounted for as a contract to perform research and development for others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6420387&loc=d3e23221-108380

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6420387&loc=d3e23199-108380

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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- Details

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Namespace Prefix:
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Licensing Revenue (Details)		3 Months Ended		9 Months Ended
Licensing Revenue (Details)	Jan. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)
Inexia License Agreement
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Upfront payment received	$ 500,000
Development milestone payments eligible to be received (up to)	8,000,000
Sales milestone payments eligible to be received (up to)	$ 37,000,000
Currax License Agreement
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Upfront payment received			$ 3,730,000
Additional revenue eligible and held in escrow				$ 750,000
Royalty Agreement
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Development milestone payments eligible to be received (up to)		$ 3,000,000		3,000,000
Sales milestone payments eligible to be received (up to)				$ 1,000,000
Percentage of royalty		0.10		0.10
Licensing revenue		$ 0		$ 0