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

No definition available.

Name:	rmti_MinimumPeriodForNonCashExchangeOfPreviouslyIssuedSharesInExchangeForNewlyIssuedShares
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 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=116856206&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

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

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

Stock-Based Compensation - Stock-based compensation (Details) - shares	12 Months Ended		120 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Apr. 07, 2017	Jan. 29, 2018
2007 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			0
Common stock reserved for issuance			11,500,000
2018 LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance				3,300,000
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
Service Based Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	1,103,938	1,447,479