Debt Instrument, Cancellation Fee Rate

No definition available.

Name:	rsys_DebtInstrumentCancellationFeeRate
Namespace Prefix:	rsys_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Interest Rate, Stated Percentage, Annual

+ References

No definition available.

+ Details

Name:	rsys_DebtInstrumentInterestRateStatedPercentageAnnual
Namespace Prefix:	rsys_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Interest Rate, Stated Percentage, Default Rate

+ References

No definition available.

+ Details

Name:	rsys_DebtInstrumentInterestRateStatedPercentageDefaultRate
Namespace Prefix:	rsys_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Redemption Covenant, Sale Proceeds

+ References

No definition available.

+ Details

Name:	rsys_DebtInstrumentRedemptionCovenantSaleProceeds
Namespace Prefix:	rsys_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Redemption Covenant, Sale Proceeds, If In Default

+ References

No definition available.

+ Details

Name:	rsys_DebtInstrumentRedemptionCovenantSaleProceedsIfInDefault
Namespace Prefix:	rsys_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Redemption Installment, Payable Amount

+ References

No definition available.

+ Details

Name:	rsys_DebtInstrumentRedemptionInstallmentPayableAmount
Namespace Prefix:	rsys_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

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

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

+ Details

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

- Definition

Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=rsys_NotePurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	rsys_DebtInstrumentRangeAxis=rsys_OnOrBeforeJanuary32020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	rsys_DebtInstrumentRangeAxis=rsys_OnOrAfterJanuary42020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	rsys_DebtInstrumentRangeAxis=rsys_ThroughJune302018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	rsys_DebtInstrumentRangeAxis=rsys_OnOrAfterJuly12018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Hale Capital Note Purchase Agreement) (Details) - Subsequent Event - Note Purchase Agreement - Senior Notes - USD ($)	Jan. 03, 2018	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Aug. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 17,000,000
Stated interest rate	4.50%
Debt instrument, basis spread on variable rate	5.75%
Stated interest rate, annual	10.25%
Interest rate, default rate	5.00%
Redemption covenant, sales proceeds	33.00%
Redemption covenant, sales proceeds, if in default	100.00%
Debt issuance costs	$ 2,000,000
Forecasted
Debt Instrument [Line Items]
Redemption installment, payable amount		$ 1,500,000.0	$ 1,250,000.00	$ 1,750,000.00	$ 1,500,000.0
On Or Before January 3 2020
Debt Instrument [Line Items]
Cancellation fee rate	5.00%
On Or After January 4 2020
Debt Instrument [Line Items]
Cancellation fee rate	3.00%
Through June 30 2018
Debt Instrument [Line Items]
Restricted cash	$ 4,000,000
On Or After July 1 2018
Debt Instrument [Line Items]
Restricted cash	$ 6,000,000