Percentage of the total cost to build-out leased facility received from the lessor.

No definition available.

Name:	oxfd_CostToBuildFacilityPercentage
Namespace Prefix:	oxfd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Additional increase in the borrowing capacity when certain conditions are met, under a debt agreement on the amount that could be borrowed with a combination of, but not limited to, a line of credit and term loan.

+ References

No definition available.

+ Details

Name:	oxfd_DebtAgreementAdditionalIncrease
Namespace Prefix:	oxfd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the percentage of the exit fee under the debt agreement.

+ References

No definition available.

+ Details

Name:	oxfd_DebtAgreementExitFeePercentage
Namespace Prefix:	oxfd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The final payment fee expressed as a percentage of the aggregate loan amount.

+ References

No definition available.

+ Details

Name:	oxfd_DebtAgreementFinalCommitmentFeePercentage
Namespace Prefix:	oxfd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under a debt agreement on the amount that could be borrowed with a combination of, but not limited to, a line of credit and term loan.

+ References

No definition available.

+ Details

Name:	oxfd_DebtAgreementMaximumBorrowingCapacity
Namespace Prefix:	oxfd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under a debt agreement on the amount that could be borrowed with a combination of, but not limited to, a line of credit and term loan. Including additional increases to both when certain conditions are met.

+ References

No definition available.

+ Details

Name:	oxfd_DebtAgreementMaximumBorrowingCapacityIncludingAdditionalIncrease
Namespace Prefix:	oxfd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the term of the required periodic payments applied to interest.

+ References

No definition available.

+ Details

Name:	oxfd_DebtInstrumentPeriodicPaymentTerm
Namespace Prefix:	oxfd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the term of the required periodic payments applied to interest with the ability to extend the duration subject to certain conditions.

+ References

No definition available.

+ Details

Name:	oxfd_DebtInstrumentPeriodicPaymentTermPotentialExtension
Namespace Prefix:	oxfd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of prepayment and exit fees associated with a debt instrument.

+ References

No definition available.

+ Details

Name:	oxfd_DebtInstrumentPrepaymentAndExitFees
Namespace Prefix:	oxfd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fee for early termination for the first year expressed as a percentage of commitment amount.

+ References

No definition available.

+ Details

Name:	oxfd_LineOfCreditFacilityEarlyTerminationCommitmentFeePercentageFirstYear
Namespace Prefix:	oxfd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The fee for early termination for the second year expressed as a percentage of commitment amount.

+ References

No definition available.

+ Details

Name:	oxfd_LineOfCreditFacilityEarlyTerminationCommitmentFeePercentageSecondYear
Namespace Prefix:	oxfd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The fee for early termination for the third year and thereafter expressed as a percentage of commitment amount.

+ References

No definition available.

+ Details

Name:	oxfd_LineOfCreditFacilityEarlyTerminationCommitmentFeePercentageThirdYearAndThereafter
Namespace Prefix:	oxfd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

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

- Definition

This item represents the deferred credit for an incentive or inducement received by a lessee from a lessor, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental expense over the lease term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 55
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=77891322&loc=d3e41620-112719

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e40010-112707

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

Name:	us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Cash payments for and related to principal collection on loans related to operating activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585

+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=oxfd_MidCapAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=oxfd_MidCapFinancialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=oxfd_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=oxfd_MarlboroughMassachusettsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 10 - Loans Payable (Details Textual)				3 Months Ended	12 Months Ended
Note 10 - Loans Payable (Details Textual)	Nov. 06, 2018 USD ($)	Sep. 25, 2018 USD ($)	Oct. 04, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2013 USD ($) ft²
Cost to Build Facility, Percentage							80.00%
Operating Lease, Right-of-Use Asset					$ 7,443,000
Gain (Loss) on Extinguishment of Debt, Total						$ (2,105,000)
MidCap Agreement [Member] \| MidCap Financial [Member]
Debt Agreement, Maximum Borrowing Capacity			$ 40,000,000
Debt Agreement, Maximum Borrowing Capacity, Including Additional Increase			$ 60,000,000
Debt Agreement, Final Commitment Fee Percentage			6.00%
Payments for Loans	$ 32,300,000
Debt Instrument, Prepayment and Exit Fees	$ 2,300,000	$ 2,300,000
Gain (Loss) on Extinguishment of Debt, Total				$ (2,100,000)
MidCap Agreement [Member] \| MidCap Financial [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 10,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.50%
Line of Credit Facility, Early Termination, Commitment Fee Percentage, First Year			3.00%
Line of Credit Facility, Early Termination, Commitment Fee Percentage, Second Year			2.00%
Line of Credit Facility, Early Termination, Commitment Fee Percentage, Third Year and Thereafter			1.00%
MidCap Agreement [Member] \| MidCap Financial [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate			4.45%
MidCap Agreement [Member] \| MidCap Financial [Member] \| Term Loan [Member]
Long-term Debt, Total			$ 30,000,000
Debt Instrument, Term			5 years
Debt Instrument, Periodic Payment, Term			2 years
Debt Instrument, Periodic Payment, Term, Potential Extension			4 years
Debt Agreement, Additional Increase			$ 10,000,000
Debt Agreement, Exit Fee, Percentage			6.00%
MidCap Agreement [Member] \| MidCap Financial [Member] \| Term Loan [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate			7.60%
Marlborough, Massachusetts [Member]
Area of Real Estate Property \| ft²							14,500
Incentive from Lessor							$ 582,000
Operating Lease, Right-of-Use Asset					$ 159,000