Commitments and Contingencies (Details) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($)
Commitments and Contingencies.
Self insurance retention	$ 1.0

Represents the amount of self insurance retention.

No definition available.

Name:	rmti_SelfInsuranceRetentionAmount
Namespace Prefix:	rmti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration