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Summary of significant accounting policies - Additional Information (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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Jul. 22, 2013
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Mar. 25, 2013
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| Debt Instrument [Line Items] | ||||
| Allowance for doubtful accounts | $ 50,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | $ 103,800us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | ||
| Reverse stock split conversion ratio | 4us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 | |||
| Bill and Hold Transactions | 1,020,000tcgn_RevenueRecognizedBillAndHoldTransactions | 0tcgn_RevenueRecognizedBillAndHoldTransactions | ||
| Advertising expense | 281,330us-gaap_AdvertisingExpense | 242,200us-gaap_AdvertisingExpense | ||
| Research and development costs reimbursed by government agencies | 74,800tcgn_ResearchAndDevelopmentArrangementsWithGovernmentAgenciesCustomerFundingToOffsetCostsIncurred | 127,500tcgn_ResearchAndDevelopmentArrangementsWithGovernmentAgenciesCustomerFundingToOffsetCostsIncurred | ||
| Research and development | 1,116,283tcgn_ResearchAndDevelopmentExpenseGross | 1,214,489tcgn_ResearchAndDevelopmentExpenseGross | ||
| Reclassification common stock to additional paid in capital | 40,836tcgn_ReclassificationCommonStocktoAdditionalPaidinCapital | |||
| Revolving credit facility | Chief Executive Officer (John N. Hatsopoulos) | ||||
| Debt Instrument [Line Items] | ||||
| Bank credit facility |
$ 1,055,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefExecutiveOfficerMember |
$ 1,500,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefExecutiveOfficerMember |
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| X | ||||||||||
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- Definition
Reclassification, Common Stock to Additional Paid in Capital No definition available.
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| X | ||||||||||
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- Definition
Research And Development Arrangements With Government Agencies, Customer Funding To Offset Costs Incurred No definition available.
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| X | ||||||||||
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- Definition
Research And Development Expense, Gross No definition available.
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| X | ||||||||||
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- Definition
Revenue Recognized, Bill And Hold Transactions No definition available.
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| X | ||||||||||
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- Definition
Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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