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EMPLOYEE BENEFIT PLAN (Details Narrative) - USD ($) $ in Millions | 12 Months Ended | 24 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Employee Benefit Plan Details Narrative |  |  |
Employer matching contribution, percent |  |  | 1.00%
Employee contribution, percent |  |  | 4.00%
Expected employee contribution | $ 2.6 | $ 2.3 |

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- References No definition available. + Details
Name: | rdnt_EmployeeBenefitPlanDetailsNarrativeAbstract
Namespace Prefix: | rdnt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration