Line of credit facility covenants minimum cash allowed.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line of credit facility interest payments term.

+ References

No definition available.

+ Details

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Namespace Prefix:	ortx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility percentage of final payment.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ References

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

- Definition

The average effective interest rate during the reporting period.

+ References

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

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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-Name Accounting Standards Codification
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+ Details

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

- Definition

Sum of investments and unrestricted cash as of the balance sheet date.

+ References

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-Name Accounting Standards Codification
-Topic 944
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-Section S99
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Description of the conditions for borrowing under the credit facility including the nature of any restrictions.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCovenantTerms
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the frequency of periodic payments, which may be presented in a variety of ways (for example, monthly, quarterly, annually).

+ References

+ Details

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

- Definition

Date the credit facility first became available, in YYYY-MM-DD format.

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- 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

+ Details

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

- Definition

Amount of the required periodic payment applied to interest.

+ References

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

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Notes Payable - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	May 31, 2021	May 31, 2019	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Debt Instrument [Line Items]
Line of credit facility agreement date		May 31, 2019
Credit facility maximum borrowings	$ 100,000,000.0	$ 75,000,000.0
Proceeds from lines of credit					$ 3,000,000.0		$ 3,000,000.0
Credit facility, remaining borrowings	$ 67,000,000.0
Line of credit facility interest payments term	18 months
Line of credit facility, frequency of payments					monthly payments
Line of credit facility, percentage of final payment	3.50%
Final payment amount	$ 1,200,000
Line of credit facility covenants description					The Company is also subject to an ongoing minimum cash financial covenant in which the Company must maintain unrestricted cash in an amount not less than $20.0 million following the utilization of the second term loan and not less than $35.0 million following the utilization of the third term loan
Term Loan
Debt Instrument [Line Items]
Debt instrument, interest expense			$ 700,000	$ 600,000	$ 1,300,000	$ 1,100,000
Debt instrument, effective annual interest rate			8.10%		8.10%
LIBOR
Debt Instrument [Line Items]
Debt instrument, annual interest rate	5.95%
Minimum \| Second Tranche (Term Loan Available from July 1, 2022 to July 1, 2023)
Debt Instrument [Line Items]
Line of credit facility minimum cash financial covenant	$ 20,000,000.0
Minimum \| Third Tranche (Term Loan Available from July 1, 2023 to July 1, 2024)
Debt Instrument [Line Items]
Line of credit facility minimum cash financial covenant	35,000,000.0
Initial Term Loan
Debt Instrument [Line Items]
Credit facility maximum borrowings	33,000,000.0	$ 25,000,000.0
Proceeds from lines of credit	33,000,000.0
Second Tranche (Term Loan Available from July 1, 2022 to July 1, 2023)
Debt Instrument [Line Items]
Credit facility maximum borrowings	33,000,000.0
Line of Credit Facility, Covenant Terms					upon certain regulatory approvals and evidence of the Company having $100.0 million in cash and cash equivalent investments
Second Tranche (Term Loan Available from July 1, 2022 to July 1, 2023) \| Minimum
Debt Instrument [Line Items]
Cash and cash equivalent investments	100,000,000.0
Third Tranche (Term Loan Available from July 1, 2023 to July 1, 2024)
Debt Instrument [Line Items]
Credit facility maximum borrowings	$ 34,000,000.0
Line of Credit Facility, Covenant Terms					upon evidence of the Company having $100.0 million in cash and cash equivalent investments and attaining a pre-specified trailing 12-month revenue target.
Line of credit facility interest payments term	30 months
Third Tranche (Term Loan Available from July 1, 2023 to July 1, 2024) \| Minimum
Debt Instrument [Line Items]
Cash and cash equivalent investments	$ 100,000,000.0