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Stockholders' equity - Stock-Based Compensation (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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| Tecogen |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options granted |
318,325us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
|
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| Fair value of options issued |
$ 577,029us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
|
$ 80,952us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
|
| Recognized stock-based compensation |
117,138us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
|
59,678us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
|
| Compensation cost related to unvested restricted stock awards and stock option awards not yet recognized |
156,179us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
|
124,845us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
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| Compensation cost not yet recognized, weighted average period of recognition |
0 years 6 months 22 days
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| Tecogen | Exercise price $3.20 per share |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options granted |
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37,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= tcgn_ExercisePriceOneMember
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| Options granted, exercise price in usd per share |
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$ 3.20tcgn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansGrantedExercisePrice
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= tcgn_ExercisePriceOneMember
|
| Weighted-average grant date fair value of options granted |
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$ 0.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= tcgn_ExercisePriceOneMember
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| Tecogen | Exercise price $3.20 per share |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Options granted |
318,325us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= tcgn_ExercisePriceThreeMember
|
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| Options granted, exercise price in usd per share |
$ 4.50tcgn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansGrantedExercisePrice
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= tcgn_ExercisePriceThreeMember
|
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| Weighted-average grant date fair value of options granted |
$ 1.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= tcgn_ExercisePriceThreeMember
|
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| Tecogen | Exercise price $4.50 per share |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options granted |
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39,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= tcgn_ExercisePriceTwoMember
|
| Options granted, exercise price in usd per share |
$ 5.39tcgn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansGrantedExercisePrice
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= tcgn_ExercisePriceTwoMember
|
$ 4.50tcgn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansGrantedExercisePrice
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= tcgn_ExercisePriceTwoMember
|
| Weighted-average grant date fair value of options granted |
|
$ 1.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= tcgn_ExercisePriceTwoMember
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| Tecogen | Stock Options |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting period |
4 years
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4 years
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| Award expiration period |
10 years
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10 years
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| Tecogen | Restricted stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unvested restricted stock outstanding |
163,350us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
|
361,570us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
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| Tecogen | Restricted stock | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting period |
90 days
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| Vesting percentage |
100.00%tcgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
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| Tecogen | Restricted stock | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Award vesting period |
1 year
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| Vesting percentage |
100.00%tcgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
|
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| Tecogen | Performance Shares |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Options granted |
100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
|
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| Award vesting period |
1 year
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| Tecogen | Amended Plan | Stock Options |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares of common stock reserved for future issuance |
3,838,750us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_PlanNameAxis
= tcgn_AmendnedStockOptionAndIncentivePlan2006Member
|
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| Number of shares remaining available for future issuance |
1,748,783us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_PlanNameAxis
= tcgn_AmendnedStockOptionAndIncentivePlan2006Member
|
58,683us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_PlanNameAxis
= tcgn_AmendnedStockOptionAndIncentivePlan2006Member
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| Ilois |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Options granted |
100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ dei_LegalEntityAxis
= tcgn_IloisMember
|
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| Options granted, exercise price in usd per share |
$ 0.50tcgn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansGrantedExercisePrice
/ dei_LegalEntityAxis
= tcgn_IloisMember
|
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| Recognized stock-based compensation |
9,798us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= tcgn_IloisMember
|
(41,311)us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= tcgn_IloisMember
|
| Compensation cost related to unvested restricted stock awards and stock option awards not yet recognized |
$ 14,478us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ dei_LegalEntityAxis
= tcgn_IloisMember
|
$ 9,004us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ dei_LegalEntityAxis
= tcgn_IloisMember
|
| Compensation cost not yet recognized, weighted average period of recognition |
1 year 2 months 25 days
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| Ilois | Restricted stock |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Unvested restricted stock outstanding |
310,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= tcgn_IloisMember
|
310,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= tcgn_IloisMember
|
| Ilois | Restricted stock | Minimum |
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Award vesting period |
90 days
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| Vesting percentage |
100.00%tcgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= tcgn_IloisMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
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| Ilois | Restricted stock | Maximum |
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
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| Award vesting period |
1 year
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| Vesting percentage |
100.00%tcgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ dei_LegalEntityAxis
= tcgn_IloisMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
|
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| Ilois | 2009 Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Maximum number of shares allowable for issuance |
2,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ dei_LegalEntityAxis
= tcgn_IloisMember
/ us-gaap_PlanNameAxis
= tcgn_StockIncentivePlan2009Member
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