Represents the minimum period for non-cash exchange of previously issued shares in exchange for newly issued shares.

No definition available.

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Namespace Prefix:	rmti_
Data Type:	xbrli:durationItemType
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

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

- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

+ References

No definition available.

+ Details

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

- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=rmti_LongTermIncentivePlan2007Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock-Based Compensation - Narrative (Details) - shares		12 Months Ended	45 Months Ended
Stock-Based Compensation - Narrative (Details) - shares	May 18, 2020	Dec. 31, 2021	Dec. 31, 2020	Jan. 29, 2018	Apr. 11, 2017
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum period for non-cash exchange of previously issued shares in exchange for newly issued shares		6 months
2007 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			0
Common stock reserved for issuance (in shares)					11,500,000
2018 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)	6,200,000			3,300,000
Common stock, number of additional shares authorized for issuance (in shares)	2,900,000