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CREDIT FACILITIES AND LONG-TERM DEBT - Asset-backed Senior Term Debt Facilities (Details)	12 Months Ended
	Dec. 31, 2022
Multiple Term Loan Facilities | Senior Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Withdrawal period	60 months

X

- Definition

Debt Instrument, Term, Withdrawal Period, Maximum m

+ References

No definition available.

+ Details

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

X

- 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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: