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Cash, Cash Equivalents and Short-term Investments - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020
Maximum
Cash And Cash Equivalents [Line Items]
Short term investments contractual maturity term	1 year

X

- Definition

Represents information pertaining to short-term investments contractual maturity period.

+ References

No definition available.

+ Details

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Namespace Prefix:	real_
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

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

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: