Name:	onsm_COMMITMENTSANDCONTINGENCIESDetailsLineItems
Namespace Prefix:	onsm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Cash paid.

No definition available.

Name:	onsm_CashPaid
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Estimated shortfall liability recorded.

No definition available.

Name:	onsm_EstimatedShortfallLiability
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The percentage amount by which base salary of an executive is reinstated.

No definition available.

Name:	onsm_ExecutiveBaseSalaryPercentageReinstated
Namespace Prefix:	onsm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Executive cash compensation, percentage of company sale price, per executive.

No definition available.

Name:	onsm_ExecutiveCashCompensationPercentageOfCompanySalePricePerExecutive
Namespace Prefix:	onsm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Periodic auto allowance payment per month as per the executive compensation agreement.

No definition available.

Name:	onsm_ExecutiveCompensationAgreementPeriodicAutoAllowancePayment
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Periodic retirement savings payment per month as per executive compensation agreement.

No definition available.

Name:	onsm_ExecutiveCompensationAgreementPeriodicRetirementSavingsPayment
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Executive compensation to be paid in cash.

No definition available.

Name:	onsm_ExecutiveCompensationCash
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Executive compensation per executive.

No definition available.

Name:	onsm_ExecutiveCompensationPerExecutive
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Annual Reimbursement of dues or charitable donations as per the executive compenstion agreement

No definition available.

Name:	onsm_ExecutiveCompenstionAgreementAnnualReimbursementOfDuesOrCharitableDonations
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Percentage deducted from the amount paid to the executives.

No definition available.

Name:	onsm_ExecutivePaymentPercentageDeduction
Namespace Prefix:	onsm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Compensation paid in fully vested shares to each executive.

No definition available.

Name:	onsm_ExecutiveShareBasedCompensationPerExecutiveShares
Namespace Prefix:	onsm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Fully vested shares paid as compensation to executives.

No definition available.

Name:	onsm_ExecutiveShareBasedCompensationShares
Namespace Prefix:	onsm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Common stock issuance price.

No definition available.

Name:	onsm_IssuePrice
Namespace Prefix:	onsm_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Percentage annual increase in lease rental.

No definition available.

Name:	onsm_LeaseRentalPercentageAnnualIncrease
Namespace Prefix:	onsm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Percentage rent increase in year one.

No definition available.

Name:	onsm_LeaseRentalPercentageRentIncreaseInOneYear
Namespace Prefix:	onsm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Non-cash compensation expense.

No definition available.

Name:	onsm_NonCashCompensationExpense
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Cost of revenue related to operating lease.

No definition available.

Name:	onsm_OperatingLeaseCostofRevenue
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Operating lease rent expense periodic payment.

No definition available.

Name:	onsm_OperatingLeaseRentExpensePeriodicPayment
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Reduction of non-cash compensation expense.

No definition available.

Name:	onsm_ReductionOfNoncashCompensationExpense
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

Compared per share amount of the gross proceeds from resale of executive shares.

No definition available.

Name:	onsm_ResaleOfExecutiveSharesComparedAmountPerShare
Namespace Prefix:	onsm_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Minimum bid price required for listing.

No definition available.

Name:	onsm_SharePriceThresholdValueForListing
Namespace Prefix:	onsm_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Value of restricted stock issued during the period for debt issuance and related expenses.

No definition available.

Name:	onsm_StockIssuedDuringThePeriodRestrictedStockForDebtIssuanceAndRelatedExpenseValue
Namespace Prefix:	onsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The volume weighted-average price for a stock over a period of time.

No definition available.

Name:	onsm_WeightedAverageExercisePrice
Namespace Prefix:	onsm_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

Name:	us-gaap_AdditionalPaidInCapital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitment made to pay deferred cash remuneration expressed as a percentage of the individual's base salary.

No definition available.

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

Amount of increase (decrease) of consideration paid in advance for rent that provides economic benefits in future periods.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

No definition available.

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The minimum amount the entity agreed to spend under the long-term purchase commitment.

No definition available.

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

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 25
-Paragraph 5
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Name:	us-gaap_OperatingLeasesRentExpenseMinimumRentals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of expense or loss included in net income that result in no cash flow, classified as other.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Name:	us-gaap_OtherNoncashExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Payments of cash to employees, including wages and salaries, during the current period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (d)
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Name:	us-gaap_PaymentsToEmployees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The number of restricted shares issued as compensation, net of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

No definition available.

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

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Gross number of share options (or share units) granted during the period.

No definition available.

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

Price of a single share of a number of saleable stocks of a company.

No definition available.

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

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Number of new stock issued during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section 50
-Paragraph 2
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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

Gross number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

No definition available.

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

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

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

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

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

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

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	onsm_PurchaseCommitmentsAxis=onsm_CommitmentsArisingFromAgreementsExpiringThrough2015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionAxis=onsm_EmploymentAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionAxis=onsm_CashCompensationPerExecutiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionAxis=onsm_January222013AgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionAxis=onsm_AdditionalExecutiveSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionAxis=onsm_ExecutiveIncentiveSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=onsm_FiveOfficeLocationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=onsm_PrincipalExecutiveOfficesInFloridaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=onsm_InfiniteConferencingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=onsm_OfficeSpaceInNewYorkMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=onsm_OfficeSpaceInSanFransiscoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=onsm_FourOfficeLocationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: