Share based compensation arrangement by share based payment award award remainder vesting period1.

No definition available.

Name:	onvo_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRemainderVestingPeriod1
Namespace Prefix:	onvo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based compensation arrangement by share based payment award equity instruments other than options forfeited cancelled surrendered in period.

+ References

No definition available.

+ Details

Name:	onvo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedCancelledSurrenderedInPeriod
Namespace Prefix:	onvo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based compensation arrangement by share based payment award options grants in period upon return of common shares.

+ References

No definition available.

+ Details

Name:	onvo_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodUponReturnOfCommonShares
Namespace Prefix:	onvo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based compensation arrangement by share based payment award percentage option vested.

+ References

No definition available.

+ Details

Name:	onvo_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOptionVested
Namespace Prefix:	onvo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Sharebased compensation arrangement by sharebased payment award award vesting rights percentage on three year.

+ References

No definition available.

+ Details

Name:	onvo_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentageOnThreeYear
Namespace Prefix:	onvo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Sharebased compensation arrangement by sharebased payment award award vesting rights percentage on two year.

+ References

No definition available.

+ Details

Name:	onvo_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentageOnTwoYear
Namespace Prefix:	onvo_
Data Type:	num:percentItemType
Balance Type:	na
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

Name:	us-gaap_ClassOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=onvo_TwoThousandTwelvePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=onvo_ShareBasedCompensationAwardYearlyVestingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_ManagementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=onvo_NonExecutiveEmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=onvo_ConsultantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stockholders' Equity - Restricted Stock Awards and Restricted Stock Units - Additional Information (Detail) - shares	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2012
Class Of Stock [Line Items]
Restricted stock awards issued to member of senior management	200,000
Restricted stock units (RSUs) [Member]
Class Of Stock [Line Items]
Restricted stock awards vested during the period	106,650	250,000	255,000
Restricted stock surrendered		129,900	137,816
Restricted stock awards granted	1,309,656
Percentage of vesting schedule				25.00%
Period for vesting schedule over start date				4 years
Stock option granted with immediate vesting		129,900	137,816
Granted, Number of Shares	1,309,656
Restricted stock [Member]
Class Of Stock [Line Items]
Restricted stock awards vested during the period	6,250
Restricted stock awards granted	0
Common stock returned by holders		2,500
Granted, Number of Shares	0
Stock options [Member]
Class Of Stock [Line Items]
Restricted stock awards granted	1,309,656
Period for vesting schedule over start date	4 years
Granted, Number of Shares	1,309,656
Awards granted remainder vesting period ratably on a quarterly basis	36 months
Award vesting percentage on the two-year anniversary	50.00%
Award vesting percentage on the three-year anniversary	50.00%
Stock options [Member] \| 2012 Plan [Member]
Class Of Stock [Line Items]
Award vesting conditions	stock options generally vest on (i) the one year anniversary of the grant date, (ii) quarterly over a three year period, or (iii) over a four-year period with a quarter vesting on either the one year anniversary of employment or the one year anniversary of the vesting commencement date
Stock options [Member] \| Yearly Vesting [Member] \| 2012 Plan [Member]
Class Of Stock [Line Items]
Award vesting conditions	0
Award vesting percentage	25.00%
Senior Management [Member]
Class Of Stock [Line Items]
Restricted stock awards vested during the period	150,000
Restricted stock surrendered	50,000
Senior Management [Member] \| Restricted stock units (RSUs) [Member]
Class Of Stock [Line Items]
Restricted stock awards granted				950,000
Granted, Number of Shares				950,000
Non-Executive Employees [Member] \| Restricted stock units (RSUs) [Member]
Class Of Stock [Line Items]
Restricted stock awards granted				130,000
Granted, Number of Shares				130,000
Consultants [Member] \| Restricted stock units (RSUs) [Member]
Class Of Stock [Line Items]
Restricted stock awards granted				100,000
Percentage of vesting schedule				100.00%
Period for vesting schedule over start date				6 months
Granted, Number of Shares				100,000