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13. STOCK-BASED COMPENSATION (Details 1) (USD $) | 3 Months Ended |
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Mar. 31, 2015 | Dec. 31, 2014
Share-based Compensation [Abstract] |  |
Outstanding | 1,964,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 2,744,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Range of Exercise Prices, Lower Limit | $ 0.95 gure_ShareBasedCompensationOptionsOutstandingExercisePriceRangeLowerRangeLimit |
Range of Exercise Prices, Upper Limit | $ 12.60 gure_ShareBasedCompensationOptionsOutstandingExercisePriceRangeUpperRangeLimit |
Weighted Average Remaining Contractual Life (Years) | 2 years 4 months 28 days |

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- Definition Share Based Compensation Options Outstanding Exercise Price Range Lower Range Limit + References No definition available. + Details
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- Definition Share Based Compensation Options Outstanding Exercise Price Range Upper Range Limit + References No definition available. + Details
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- Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Period Type: | instant

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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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