CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock $0.001 Par Value	Additional Paid-in Capital	Accumulated Deficit	Noncontrolling Interest
Balance, Beginning Balance at Dec. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions to noncontrolling interest	$ (311,664)				$ (311,664)
Ownership changes to noncontrolling interest	559,500				559,500
Sale of common stock, net of costs	952,333tcgn_SaleOfCommonStockNetOfCosts	634	951,699
EuroSite stock dividend to American DG Energy investors	0		(199,408)		199,408
Non-cash debt discount (Issuance of subsidiary common stock in conjunction with prepayment of interest on and exchange of convertible debentures)	0tcgn_PaidinKindInterestPrepayment
Conversion of convertible debenture interest to common stock	1,170,051	693	1,169,358
Conversion of subsidiary convertible debentures into subsidiary common stock	0
Stock based compensation expense	596,349		538,217		58,132
Exercise of stock options	0
Fair value of conversion option	649,000us-gaap_RestrictedStockAwardForfeitures		649,000
Net loss	(5,126,278)us-gaap_ProfitLoss			(4,886,672)	(239,606)
Balance, Ending Balance at Dec. 31, 2013	12,065,911	49,818	40,110,305	(29,343,517)	1,249,305
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions to noncontrolling interest	(258,289)				(258,289)
Noncontrolling interest share of transactions affecting subsidiary ownership	(124,056)		(2,718,159)		2,594,103
Ownership changes to noncontrolling interest			4,704,500
Sale of common stock, net of costs	3,269,275tcgn_SaleOfCommonStockNetOfCosts	2,650	3,266,625
Non-cash debt discount (Issuance of subsidiary common stock in conjunction with prepayment of interest on and exchange of convertible debentures)	4,207,411tcgn_PaidinKindInterestPrepayment		4,122,500		84,911
Conversion of convertible debenture interest to common stock of subsidiary	582,000		582,000
Sale of subsidiary common stock, net of costs	1,486,329		1,486,329
Conversion of convertible debenture interest to common stock	624,368	260	624,108
Share repurchase program	(450,696)	(588)	(450,108)
Reacquisition by subsidiary of common stock	(42,902)		(42,902)
Conversion of subsidiary convertible debentures into subsidiary common stock	2,455,377		2,455,377
Stock based compensation expense	475,899		418,923		56,976
Net loss	(6,525,358)us-gaap_ProfitLoss			(5,888,894)	(636,464)
Balance, Ending Balance at Dec. 31, 2014	$ 17,765,269	$ 52,140	$ 49,854,998	$ (35,232,411)	$ 3,090,542

Paid-in-Kind Interest, Prepayment

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Amount of proceeds received from sale of common stock for lending arrangement entered into by the entity, in contemplation of a convertible debt offering or other financing.

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Shares Repurchased During Period, Value, Subsidiary

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Stock Issued During Period, Value, Conversion Of Subsidiary Convertible Debt

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Stock Issued During Period, Value, Conversion Of Units Into Subsidiary Stock

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This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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This element represents disclosure of the aggregate cash dividends paid to the entity by unconsolidated subsidiaries.

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Represents a sale by the parent of a portion of its equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The sale of the equity interest represented by this element does not result in a loss of control by the parent.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Amount of increase in noncontrolling interest from subsidiary issuance of equity interests to noncontrolling interest holders.

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No definition available.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The total value of forfeitures related to restricted stock awards forfeited during the period.

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Cash received on stock transaction after deduction of issuance costs.

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No definition available.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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The net amount of stock issued during the period upon the conversion of convertible securities, net of adjustments (for example, to additional paid in capital) including the write-off of an equity component recognized to record the convertible debt instrument as two separate components - a debt component and an equity component. This item is meant to disclose the value of shares issued on conversion of convertible securities that were recorded as two separate (debt and equity) components.

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No definition available.

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Value of stock issued as a result of the exercise of stock options.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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