Agreement Covenant, Minimum Cash

No definition available.

Name:	rmti_AgreementCovenantMinimumCash
Namespace Prefix:	rmti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Class of Warrant or Right, Purchase Price

+ References

No definition available.

+ Details

Name:	rmti_ClassOfWarrantOrRightPurchasePrice
Namespace Prefix:	rmti_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Class of Warrant or Right, Purchase Price, Discount From Stock Price Per Share

+ References

No definition available.

+ Details

Name:	rmti_ClassOfWarrantOrRightPurchasePriceDiscountFromStockPricePerShare
Namespace Prefix:	rmti_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Liquidity and Capital Resources [Line Items]

+ References

No definition available.

+ Details

Name:	rmti_LiquidityAndGoingConcernConsiderationsLineItems
Namespace Prefix:	rmti_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Proceeds from Issuance or Sale of Equity, Net of Issuance Cost

+ References

No definition available.

+ Details

Name:	rmti_ProceedsFromIssuanceOrSaleOfEquityNetOfIssuanceCost
Namespace Prefix:	rmti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Sale Of Stock, Aggregate Consideration Authorized

+ References

No definition available.

+ Details

Name:	rmti_SaleOfStockAggregateConsiderationAuthorized
Namespace Prefix:	rmti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the monetary amount of working capital, as of the indicated date.

+ References

No definition available.

+ Details

Name:	rmti_WorkingCapitalNet
Namespace Prefix:	rmti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(9))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_CashCashEquivalentsAndShortTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

+ Details

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

- Definition

Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3536-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3521-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

+ Details

Name:	us-gaap_NetCashProvidedByUsedInOperatingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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

- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementClassOfStockAxis=rmti_SeriesXConvertiblePreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=rmti_RegisteredDirectOfferingWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=rmti_PIPEPurchaseAgreementPreFundedWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=rmti_PIPEPurchaseAgreementWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=rmti_RegisteredDirectOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=rmti_DaVitaHealthcarePartnersIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	rmti_ShareIssuanceAxisAxis=rmti_ShareIssuanceTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	rmti_ShareIssuanceAxisAxis=rmti_ShareIssuanceTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=rmti_CantorFitzgeraldCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=rmti_ControlledEquityOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Liquidity and Capital Resources (Details) - USD ($)							9 Months Ended
Liquidity and Capital Resources (Details) - USD ($)	Jun. 30, 2022	Jun. 16, 2022	Jun. 15, 2022	Jun. 02, 2022	May 30, 2022	Apr. 06, 2022	Sep. 30, 2022	Sep. 30, 2021	Apr. 08, 2022
Liquidity and Going Concern Considerations [Line Items]
Cash, cash equivalents and investments available-for-sale							$ 27,600,000
Working capital							23,000,000
Net cash used in operating activities							(16,820,000)	$ (24,508,000)
Minimum cash covenant							10,000,000
Proceeds from sale of equity, net				$ 14,900,000
Series X Convertible Preferred Stock
Liquidity and Going Concern Considerations [Line Items]
Consideration received						$ 15,000,000
Proceeds from sale of equity, net						14,900,000
Registered Direct Offering Warrants
Liquidity and Going Concern Considerations [Line Items]
Number of shares of common stock for which warrant is exercisable (in shares)					7,788,480
Discount from stock price (dollars per share)					$ 0.0001
Exercise price of warrant (in dollars per share)					$ 0.0001
PIPE Purchase Agreement Pre-Funded Warrant
Liquidity and Going Concern Considerations [Line Items]
Number of shares of common stock for which warrant is exercisable (in shares)					1,267,897
Discount from stock price (dollars per share)					$ 0.0001
Exercise price of warrant (in dollars per share)					$ 0.0001
PIPE Purchase Agreement Warrant
Liquidity and Going Concern Considerations [Line Items]
Number of shares of common stock for which warrant is exercisable (in shares)					9,900,990
Exercise price of warrant (in dollars per share)					$ 1.39
Warrant price (dollars per share)					$ 0.125
Registered Direct Offering
Liquidity and Going Concern Considerations [Line Items]
Number of shares issued					844,613
Common stock trading price (in dollars per share)					$ 1.39
Registered Direct Offering \| Registered Direct Offering Warrants
Liquidity and Going Concern Considerations [Line Items]
Discount from stock price (dollars per share)					0.0001
Exercise price of warrant (in dollars per share)					$ 0.0001
Da Vita Healthcare Partners Inc \| Share Issuance, Tranche One
Liquidity and Going Concern Considerations [Line Items]
Proceeds from issuance of convertible preferred stock						7,500,000
Da Vita Healthcare Partners Inc \| Share Issuance, Tranche Two
Liquidity and Going Concern Considerations [Line Items]
Proceeds from issuance of convertible preferred stock		$ 7,500,000	$ 7,500,000
Da Vita Healthcare Partners Inc \| Private Placement \| Series X Convertible Preferred Stock
Liquidity and Going Concern Considerations [Line Items]
Sale of stock, aggregate consideration authorized						$ 15,000,000
Consideration received			$ 15,000,000
Common stock trading price (in dollars per share)						$ 1,000
Da Vita Healthcare Partners Inc \| Private Placement \| Share Issuance, Tranche One \| Series X Convertible Preferred Stock
Liquidity and Going Concern Considerations [Line Items]
Number of shares issued						7,500
Da Vita Healthcare Partners Inc \| Private Placement \| Share Issuance, Tranche Two \| Series X Convertible Preferred Stock
Liquidity and Going Concern Considerations [Line Items]
Number of shares issued		7,500	7,500
Cantor Fitzgerald & Co \| Controlled Equity Offering
Liquidity and Going Concern Considerations [Line Items]
Sale of stock, aggregate consideration authorized							$ 12,200,000		$ 12,200,000
Number of shares issued	7,500
Consideration received	$ 15,135