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STOCK-BASED COMPENSATION PLAN (Narrative) (Details)
1 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Aug. 27, 2014
USD ($)
Oct. 16, 2013
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Aug. 27, 2014
Mr. Guohua Ku [Member]
USD ($)
Sep. 05, 2014
Mr. Guohua Ku [Member]
Installments One [Member]
USD ($)
Sep. 05, 2014
Mr. Guohua Ku [Member]
Installments One [Member]
CNY
Sep. 12, 2014
Mr. Guohua Ku [Member]
Installments Two [Member]
USD ($)
Sep. 12, 2014
Mr. Guohua Ku [Member]
Installments Two [Member]
CNY
Dec. 31, 2014
Director One [Member]
Dec. 31, 2014
Director Two [Member]
Dec. 31, 2014
Director [Member]
Dec. 31, 2013
Director [Member]
Oct. 07, 2010
Independent Directors Compensation Plan [Member]
USD ($)
Jan. 20, 2010
Independent Directors Compensation Plan [Member]
USD ($)
Oct. 30, 2009
Independent Directors Compensation Plan [Member]
USD ($)
Dec. 31, 2014
Independent Directors Compensation Plan [Member]
USD ($)
Dec. 31, 2014
Cashless Exercise [Member]
Independent Directors Compensation Plan [Member]
Dec. 31, 2013
Cashless Exercise [Member]
Independent Directors Compensation Plan [Member]
Nov. 11, 2009
Employee Stock Option [Member]
USD ($)
Dec. 31, 2014
Employee Stock Option [Member]
USD ($)
Dec. 31, 2013
Employee Stock Option [Member]
USD ($)
Dec. 31, 2012
Employee Stock Option [Member]
USD ($)
Aug. 13, 2010
Employee Stock Option [Member]
Second and Third Tranche [Member]
Nov. 09, 2009
Employee Stock Option [Member]
Options Vested [Member]
Nov. 11, 2009
Employee Stock Option [Member]
Unvested Options [Member]
Dec. 31, 2014
Employee Stock Option [Member]
Cashless Exercise [Member]
Dec. 31, 2013
Employee Stock Option [Member]
Cashless Exercise [Member]
Nov. 11, 2009
2007 Plan [Member]
Employee Stock Option [Member]
Aug. 04, 2008
2007 Plan [Member]
Employee Stock Option [Member]
USD ($)
Dec. 31, 2014
2007 Plan [Member]
Employee Stock Option [Member]
Nov. 11, 2009
Two Other Employees [Member]
Employee Stock Option [Member]
USD ($)
Aug. 13, 2010
Managerial And Non Managerial Employees [Member]
2007 Plan [Member]
Employee Stock Option [Member]
USD ($)
Dec. 31, 2013
NASDAQ Global Market [Member]
Employee Stock Option [Member]
Granted                           40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
130,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
        0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
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0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
              3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= creg_TwoThousandSevenPlanMember
  290,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
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/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
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2,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= creg_ManagerialAndNonManagerialEmployeesMember
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
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/ us-gaap_PlanNameAxis
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Common Stock, Par or Stated Value Per Share     $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare                                                   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
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/ us-gaap_PlanNameAxis
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Grant date excersise price                             $ 4.68us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
$ 1.85us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
        $ 0us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 0us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
              $ 0.80us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= creg_TwoThousandSevenPlanMember
  $ 2.35us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= creg_TwoOtherEmployeesMember
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 3.05us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ dei_LegalEntityAxis
= creg_ManagerialAndNonManagerialEmployeesMember
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
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/ us-gaap_PlanNameAxis
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Vesting period                                                         3 years          
Estimated life                           5 years 5 years 5 years       5 years       5 years           5 years        
Volatility percentage rate                           87.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
100.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
100.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
      100.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
      92.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
/ creg_TrancheAxis
= creg_SecondAndThirdTrancheMember
          100.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= creg_TwoThousandSevenPlanMember
       
Risk free interest rate                           3.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
3.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
3.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
      3.84%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
      3.54%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
/ creg_TrancheAxis
= creg_SecondAndThirdTrancheMember
          2.76%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= creg_TwoThousandSevenPlanMember
       
Dividend yield                           0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= creg_IndependentDirectorsCompensationPlanMember
      0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
      0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
/ creg_TrancheAxis
= creg_SecondAndThirdTrancheMember
          0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= creg_TwoThousandSevenPlanMember
       
Grant date fair value                           $ 83,000creg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards
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= creg_IndependentDirectorsCompensationPlanMember
$ 142,000creg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
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$ 183,000creg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards
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      $ 518,513creg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards
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                  $ 5,040,000creg_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValueOfAwards
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Vesting terms                                                                 According to the vesting terms, the options granted were divided into three tranches, (i) 1/3 (one third) of the total number of shares subject to the options shall vest and become exercisable if the Company meets its minimum revenue and earnings goals in the Company’s guidance for 2010 as delivered in its earnings releases and/or conference calls in the first quarter of 2010, such vesting to occur immediately upon completion of the annual audit confirming the financial results for 2010; and (ii) an additional 1/3 (one third) of the total number of shares subject to the options shall vest and become exercisable if the Company meets certain financial goals of 2011 which will be set out and decided by the Compensation Committee, such vesting to occur immediately upon Compensation Committee’s determination that the Company has met such goals for 2011; and (iii) the remaining 1/3 (one third) of the total number of shares subject to the options shall vest and become exercisable if the Company meets certain financial goals of 2012 which is set out and decided by the Compensation Committee, such vesting is to occur immediately upon Compensation Committee’s determination that the Company has met such goals for 2012.  
Cancelled/forfeited                                                 87,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
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203,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
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= creg_UnvestedOptionsMember
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
               
Exercised                   50,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_TitleOfIndividualAxis
= creg_DirectorOneMember
10,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_TitleOfIndividualAxis
= creg_DirectorTwoMember
60,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
10,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
        60,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
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/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
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10,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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  0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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2,650,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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        0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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          2,650,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ dei_LegalEntityAxis
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Compensation per month                           2,000creg_AverageMonthlyProfessionalFees
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Stock Issued During Period, Shares, Conversion of Convertible Securities     36,124us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities 5,261us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities           30,575us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
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5,549us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
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                                            1,887,411us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
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Stock Issued During Period, Shares, Restricted Stock Award, Gross   75,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross                                                                
Stock Issued During Period, Value, Restricted Stock Award, Gross   187,500us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross                                                                
Stock Issued During Period, Shares, Other         13,829,074us-gaap_StockIssuedDuringPeriodSharesOther
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Sale of Stock, Price Per Share         $ 1.37us-gaap_SaleOfStockPricePerShare
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Proceeds from Issuance of Common Stock           12,000,000us-gaap_ProceedsFromIssuanceOfCommonStock
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74,050,000us-gaap_ProceedsFromIssuanceOfCommonStock
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6,910,000us-gaap_ProceedsFromIssuanceOfCommonStock
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42,850,000us-gaap_ProceedsFromIssuanceOfCommonStock
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Share Price $ 1.49us-gaap_SharePrice                                                                  
Shares Resale Period 180 days                                                                  
Stock options and warrants expenses     $ 187,500us-gaap_ShareBasedCompensation $ 0us-gaap_ShareBasedCompensation                                                            
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercisable, Number                                 80,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
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      733,333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
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1,023,333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
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3,733,333us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
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Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price                                 $ 3.83us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
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      $ 3.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
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$ 2.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
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$ 1.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term                                 3 months 22 days       7 months 13 days 1 year 4 months 24 days 1 year 1 month 2 days                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number                                         0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
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Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares                                                             2,200,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares
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