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Net Loss Per Share Additional Information (Details) - shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Earnings Per Share [Abstract]
Pre-funded warrants to purchase common stock	83,403,425	4,000,000

X

- Definition

Pre-funded warrants to purchase common stock.

+ References

No definition available.

+ Details

Name:	rapt_PreFundedWarrantsToPurchaseCommonStock
Namespace Prefix:	rapt_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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