v3.25.0.1

Summary of Significant Accounting Policies - Credit Risk Concentration (Details) | 12 Months Ended
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Dec. 31, 2023 $ / shares
Credit Concentration Risk [Member] |
Concentration risk |
Money market funds preserve the value of investment per share | $ 1

X
- Definition The value per share money market funds seek to preserve. + References No definition available. + Details
Name: | rsls_MoneyMarketValuePerShare
Namespace Prefix: | rsls_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 310 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478785/954-310-50-2 + Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CreditConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |