No definition available.

Name:	rcar_PeriodForAccretionOfDiscounts
Namespace Prefix:	rcar_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

+ Details

Name:	us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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

- Definition

Aggregate number of common shares reserved for future issuance.

+ 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 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Beneficial Conversion Feature
-URI http://asc.fasb.org/extlink&oid=6505963

+ Details

Name:	us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Description of the conversion terms of a debt instrument which may include the conversion ratio (including all potential conversion ratios if contingently adjustable), type of debt or equity security into which the debt is convertible, the dollars of debt or the number of shares into which the instrument is convertible (or potentially convertible into), the conversion period, any contingencies associated with the conversion terms, and the existence and amount of a beneficial conversion feature.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(5))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ 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 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expense (income) related to adjustment to fair value of warrant liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 25
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

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

- Definition

Agreed upon price for the exchange of the underlying asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssumptionsExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

+ Details

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

- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

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

- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

Reference 2: 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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.9)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- Definition

The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

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

- Definition

Amount of accretion of discount for the standardized measure of discounted future net cash flow related to proved oil and gas reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 35
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62500-109447

+ Details

Name:	us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowRelatingToProvedOilAndGasReservesAccretionOfDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentAxis=rcar_LoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rcar_JosephSierchioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rcar_KccMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_PlanNameAxis=rcar_FebruaryTwoThousandSeventeenLoanAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreationDateAxis=rcar_FromFebruaryTwentyThreeToMarchNineTwoThousandSeventeenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_InvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Details Narrative) - USD ($)		1 Months Ended				3 Months Ended		6 Months Ended		12 Months Ended
Debt (Details Narrative) - USD ($)	Sep. 09, 2016	Mar. 09, 2017	Mar. 09, 2017	Feb. 28, 2017	Feb. 23, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Interest expense						$ 20,516		$ 35,866
Accretion of debt discount						(243,781)		(418,410)
Estimated volatility										92.00%
Loan agreement [Member]
Interest expense								25,042
Accretion of debt discount								265,063
Joseph Sierchio [Member] \| Loan agreement [Member]
Interest rate					7.00%
Maturity date					Feb. 23, 2018
Convertible debt financing, Loan received					$ 25,000
Debt instrument terms of conversion feature					(i) $3.45; or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which the Holder(s) elect to convert the February 2017 Note(s), subject to a floor price of $2.76.
Joseph Sierchio [Member] \| Series F Warrant [Member] \| Loan agreement [Member]
Common stock shares reserved under stock option plan				7,246
Debt instrument terms of conversion feature				(i) $3.45; or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which the Holder elects to exercise their Series F Warrant.
KCC [Member] \| Loan agreement [Member]
Interest expense						12,698
Accretion of debt discount						133,264
Convertible debt financing, Maximum amount	$ 900,000
Interest rate	7.00%				7.00%
Maturity date	Dec. 31, 2017				Feb. 23, 2018
Convertible debt financing, Loan received	$ 700,000				$ 395,000
Convertible debt financing, Remaining amount	$ 200,000
Debt instrument terms of conversion feature	(i) $1.54; or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which KCC elects to convert the Note, subject to a floor price of $1.23.				(i) $3.45; or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which the Holder(s) elect to convert the February 2017 Note(s), subject to a floor price of $2.76.
Exercise Price	$ 1.25
Market price of common stock	$ 1.54
Estimated volatility	92.30%
Risk free interest rate	1.23%
Expected dividend rate	0.00%
Expected life	5 years
Fair value	$ 340,735
Beneficial conversion intrinsic value	359,265
Debt discount	$ 700,000					$ 289,939
Period for accretion of discount	1.25 years					The remaining debt discount of $289,939 will be amortized over the next two quarters through December 31, 2017
KCC [Member] \| Series F Warrant [Member] \| Loan agreement [Member]
Common stock shares reserved under stock option plan				114,493
Debt instrument terms of conversion feature				(i) $3.45; or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which the Holder elects to exercise their Series F Warrant.
KCC [Member] \| Series E Warrant [Member] \| Loan agreement [Member]
Common stock shares reserved under stock option plan	584,416
Debt instrument terms of conversion feature	(i) $1.54; or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which KCC elects to exercise the Series E Warrant.
February 2017 Loan Agreements [Member] \| From February 23, 2017 to March 9, 2017 [Member]
Interest expense						$ 7,819		10,824
Accretion of debt discount						110,517		$ 153,347
Debt discount						$ 289,939
Period for accretion of discount						The remaining debt discount of $400,456 will be amortized over the next three quarters through March 31, 2018
February 2017 Loan Agreements [Member] \| From February 23, 2017 to March 9, 2017 [Member] \| Series F Warrant [Member]
Common stock shares reserved under stock option plan		128,985	128,985
Debt instrument terms of conversion feature			(i) $3.45, the closing price of the Company’s common stock as quoted on the OTCQB on the day prior to issuance of the Warrant; or (ii) a twenty percent (20%) discount to the average closing price of the Company’s common stock as quoted on the OTCQB for the five days prior to the date on which the holder elects to exercise the Warrant
February 2017 Loan Agreements [Member] \| From February 23, 2017 to March 9, 2017 [Member] \| Investor [Member]
Convertible debt financing, Maximum amount		$ 25,000	$ 25,000
Interest rate		7.00%	7.00%
Maturity date		Feb. 23, 2018
Debt instrument terms of conversion feature		(i) $3.45, the closing price of the Company’s common stock on the day prior to the issuance of the February 2017 Notes or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which the Holder(s) elect to convert the February 2017 Note(s), subject to a floor price of $2.76
February 2017 Loan Agreements [Member] \| From February 23, 2017 to March 9, 2017 [Member] \| Investor [Member] \| Series F Warrant [Member]
Common stock shares reserved under stock option plan		7,246	7,246
Debt instrument terms of conversion feature		(i) $3.45, the closing price of the Company’s common stock on the day prior to issuance of the Series F Warrant; or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which the Holder elects to exercise their Series F Warrant
February 2017 Loan Agreements [Member] \| From February 23, 2017 to March 9, 2017 [Member] \| Joseph Sierchio [Member]
Convertible debt financing, Maximum amount		$ 25,000	$ 25,000
Interest rate		7.00%	7.00%
Maturity date		Feb. 23, 2018
Debt instrument terms of conversion feature		(i) $3.45, the closing price of the Company’s common stock on the day prior to the issuance of the February 2017 Notes or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which the Holder(s) elect to convert the February 2017 Note(s), subject to a floor price of $2.76
February 2017 Loan Agreements [Member] \| From February 23, 2017 to March 9, 2017 [Member] \| Joseph Sierchio [Member] \| Series F Warrant [Member]
Common stock shares reserved under stock option plan		7,246	7,246
Debt instrument terms of conversion feature		(i) $3.45, the closing price of the Company’s common stock on the day prior to issuance of the Series F Warrant; or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which the Holder elects to exercise their Series F Warrant
February 2017 Loan Agreements [Member] \| From February 23, 2017 to March 9, 2017 [Member] \| KCC [Member]
Convertible debt financing, Maximum amount		$ 395,000	$ 395,000
Interest rate		7.00%	7.00%
Maturity date		Feb. 23, 2018
Debt instrument terms of conversion feature		(i) $3.45, the closing price of the Company’s common stock on the day prior to the issuance of the February 2017 Notes or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which the Holder(s) elect to convert the February 2017 Note(s), subject to a floor price of $2.76
February 2017 Loan Agreements [Member] \| From February 23, 2017 to March 9, 2017 [Member] \| KCC [Member] \| Series F Warrant [Member]
Common stock shares reserved under stock option plan		114,493	114,493
Debt instrument terms of conversion feature		(i) $3.45, the closing price of the Company’s common stock on the day prior to issuance of the Series F Warrant; or (ii) a 20% discount to the average closing price of the Company’s common stock for the five days prior to the date on which the Holder elects to exercise their Series F Warrant