Significant Accounting Policies - Assumptions Used for Common Stock Warrant Liability Outstanding (Details 1) - Common stock warrants liability outstanding	9 Months Ended
Sep. 30, 2015 $ / shares
June 3, 2013
Class of Warrant or Right [Line Items]
Exercise Price	$ 11.20
Closing Market Price	$ 1.18
Risk-free Rate	0.78%
Market Price Volatility	130.00%
Remaining Term (years)	2 years 8 months 5 days
Expected dividend yield	0.00%
Probability of change in control	15.00%
November 15, 2013
Class of Warrant or Right [Line Items]
Exercise Price	$ 68.20
Closing Market Price	$ 1.18
Risk-free Rate	1.03%
Market Price Volatility	130.00%
Remaining Term (years)	3 years 7 months 17 days
Expected dividend yield	0.00%
Probability of change in control	15.00%
July 9, 2014
Class of Warrant or Right [Line Items]
Exercise Price	$ 63.80
Closing Market Price	$ 1.18
Risk-free Rate	1.15%
Market Price Volatility	120.00%
Remaining Term (years)	4 years 3 months 11 days
Expected dividend yield	0.00%
Probability of change in control	15.00%
November 18, 2014
Class of Warrant or Right [Line Items]
Exercise Price	$ 16.20
Closing Market Price	$ 1.18
Risk-free Rate	1.56%
Market Price Volatility	107.00%
Remaining Term (years)	6 years 1 month 21 days
Expected dividend yield	0.00%
February 26, 2015
Class of Warrant or Right [Line Items]
Exercise Price	$ 1.24
Closing Market Price	$ 1.18
Risk-free Rate	1.35%
Market Price Volatility	113.70%
Remaining Term (years)	4 years 10 months 24 days
Expected dividend yield	0.00%
Probability of change in control	15.00%
March 17-31, 2015
Class of Warrant or Right [Line Items]
Closing Market Price	$ 1.18
Risk-free Rate	0.14%
Market Price Volatility	138.40%
Remaining Term (years)	7 months 6 days
Expected dividend yield	0.00%

Probability of Change in Control Assumed

No definition available.

Name:	rgse_ProbabilityOfChangeInControlAssumed
Namespace Prefix:	rgse_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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 (e)

-URI http://asc.fasb.org/extlink&oid=36462937&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

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

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

- Details

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

- Details

Name:	us-gaap_AwardDateAxis=rgse_JuneThreeTwoThousandThirteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=rgse_NovemberFifteenTwoThousandThirteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=rgse_JulyNineTwoThousandFourteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=rgse_NovemberEighteenTwoThousandFourteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=rgse_FebruaryTwentySixTwoThousandFifteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardDateAxis=rgse_MarchSeventeenToThirtyFirstTwoThousandFifteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: