Stockholders' equity - Stock Option Activity (Details) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Exercise Price Per Share [Abstract]
Expired, Exercise Price (usd per share)	$ 0.00
Tecogen
Stock Options Outstanding [Roll Forward]
Beginning (shares)	1,148,000	1,096,500	1,096,500	1,095,250
Granted (shares)	43,325		76,500	17,500
Exercised (shares)	(5,000)		(25,000)	0
Canceled and forfeited (shares)	0		0	(15,938)
Expired (shares)	0		0	(313)
Ending (shares)	1,186,325		1,148,000	1,096,500
Exercisable (shares)	919,250		799,500	662,563
Vested and expected to vest (shares)	1,186,325		1,148,000
Weighted Average Exercise Price [Roll Forward]
Beginning (usd per share)	$ 2.13	$ 1.96	$ 1.96	$ 1.92
Granted (usd per share)	$ 4.50		$ 3.86	$ 3.20
Exercised (usd per share)	$ 1.20		$ 0.12	$ 0.00
Canceled and forfeited (usd per share)	$ 0.00		$ 0.00	$ 1.28
Expired (usd per share)	$ 0.00		$ 0.00	$ 2.60
Ending (usd per share)	$ 2.22		$ 2.13	$ 1.96
Exercisable (usd per share)	$ 1.90		$ 1.79	$ 1.56
Vested and expected to vest (usd per share)	$ 2.22		$ 2.13
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Outstanding, Weighted Average Remaining Life	5 years 8 months 23 days			5 years 9 months 18 days
Outstanding, Aggregate Intrinsic Value	$ 2,704,600		$ 2,721,100	$ 1,356,400	$ 1,387,150
Exercisable, Aggregate Intrinsic Value	2,387,075		2,166,550	1,096,225
Vested and expected to vest, Aggregate Intrinsic Value	2,704,600
Exercise Price Per Share [Abstract]
Granted, Exercise Price (usd per share)	$ 4.50			$ 3.20
Exercised, Exercise Price (usd per share)	$ 1.20		$ 0.12	$ 0
Canceled and Forfeited, Exercise Price (usd per share)	$ 0		$ 0
Expired, Exercise Price (usd per share)			$ 0.00	$ 2.60
Ilois
Stock Options Outstanding [Roll Forward]
Beginning (shares)	575,000	575,000	575,000	525,000
Granted (shares)	0		0	50,000
Exercised (shares)	0		0	0
Canceled and forfeited (shares)	0		0	0
Expired (shares)	0		0	0
Ending (shares)	575,000		575,000	575,000	525,000
Exercisable (shares)	125,000		0	0
Vested and expected to vest (shares)	575,000		575,000
Weighted Average Exercise Price [Roll Forward]
Beginning (usd per share)	$ 0.29	$ 0.29	$ 0.29	$ 0.27
Granted (usd per share)	$ 0.00		$ 0.00	$ 0.50
Exercised (usd per share)	$ 0		$ 0.00	$ 0.00
Canceled and forfeited (usd per share)	$ 0		$ 0.00	$ 0.00
Expired (usd per share)	$ 0		$ 0.00	$ 0.00
Ending (usd per share)	$ 0.29		$ 0.29	$ 0.29	$ 0.27
Exercisable (usd per share)	$ 0.50		$ 0.50	$ 0.00
Vested and expected to vest (usd per share)	$ 0.29		$ 0.29	$ 0.29
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Outstanding, Weighted Average Remaining Life	6 years 2 months 9 days	6 years 5 months 9 days	6 years 5 months 9 days	7 years 5 months 7 days	8 years 2 months 22 days
Outstanding, Aggregate Intrinsic Value	120,000		120,000	120,000	120,000
Exercisable, Aggregate Intrinsic Value	0		0	0
Vested and expected to vest, Aggregate Intrinsic Value	$ 120,000		$ 120,000	$ 120,000
Exercise Price Per Share [Abstract]
Granted, Exercise Price (usd per share)	$ 0.00		$ 0.00	$ 0.50
Exercised, Exercise Price (usd per share)	$ 0		$ 0	$ 0
Canceled and Forfeited, Exercise Price (usd per share)	$ 0		$ 0	$ 0
Expired, Exercise Price (usd per share)	$ 0		$ 0	$ 0
Stock options \| Tecogen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life			5 years 7 months 18 days	6 years 3 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Outstanding, Weighted Average Remaining Life			5 years 9 months 20 days	4 years 7 months 28 days	5 years 6 months 11 days
Exercise Price Per Share [Abstract]
Risk-free interest rate			1.34%	0.70%
Stock options \| Ilois
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life				6 years 3 months
Exercise Price Per Share [Abstract]
Risk-free interest rate				2.03%
Restricted stock \| Tecogen
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	361,570		361,570	399,070	483,317
Exercise Price Per Share [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 1.31		$ 1.31	$ 1.44	$ 1.44
Granted (shares)	0		0	0
Granted (usd per share)	$ 0.00		$ 0.00	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	0		0	0
Vested (usd per share)	$ 0		$ 0.00	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0		37,500	84,247
Forfeited (usd per share)	$ 0.00		$ 2.60	$ 1.36
Restricted stock \| Ilois
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number			310,000	510,000
Exercise Price Per Share [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 0.10		$ 0.10
Granted (shares)	0
Granted (usd per share)	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	0
Vested (usd per share)	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	0
Forfeited (usd per share)	$ 0.00

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Cancellations and Forfeitures in Period

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Cancellations and Forfeitures in Period, Weighted Average Exercise Price

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Share Based Compensation Share Authorized Under Stock Option Plans, Expired, Exercise Price

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Share Based Compensation Shares Authorized Under Stock Option Plans, Cancelled and Forfeited, Exercise Price

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Share Based Compensation Shares Authorized Under Stock Option Plans, Exercised, Exercise Price

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Share Based Compensation Shares Authorized Under Stock Option Plans, Granted, Exercise Price

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

No definition available.

+ Details

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

+ References

No definition available.

+ Details

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.28,29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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