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Stockholders' equity - Stock-Based Compensation (Details) (USD $)
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12 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||
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Dec. 31, 2011
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Dec. 10, 2011
Tecogen
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Dec. 31, 2012
Tecogen
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Dec. 31, 2011
Tecogen
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Dec. 31, 2011
Tecogen
Exercise price $0.65 per share
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Dec. 31, 2011
Tecogen
Exercise price $0.70 per share
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Dec. 31, 2012
Tecogen
Exercise price $0.80 per share
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Dec. 31, 2012
Tecogen
Stock options
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Dec. 31, 2011
Tecogen
Stock options
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Dec. 31, 2012
Tecogen
Restricted stock
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Dec. 31, 2011
Tecogen
Restricted stock
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Dec. 31, 2010
Tecogen
Restricted stock
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Dec. 31, 2011
Tecogen
Restricted stock
Six months after an initial public offering
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Dec. 31, 2012
Tecogen
Amended Plan
Stock options
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Dec. 31, 2011
Tecogen
Amended Plan
Stock options
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Dec. 31, 2006
Tecogen
Amended Plan
Stock options
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Dec. 31, 2012
Ilois
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Dec. 31, 2011
Ilois
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Dec. 31, 2012
Ilois
Restricted stock
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Dec. 31, 2011
Ilois
Restricted stock
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Dec. 31, 2010
Ilois
Restricted stock
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Dec. 31, 2011
Ilois
Restricted stock
180 days after an initial public offering of Ilios
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Dec. 31, 2011
Ilois
Restricted stock
3 years after initial public offering of Ilios
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Dec. 31, 2012
Ilois
2009 Plan
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||||||
| Shares of common stock reserved for future issuance | 7,355,000 | 4,000,000 | ||||||||||||||||||||||
| Number of shares remaining available for future issuance | 540,732 | 645,732 | ||||||||||||||||||||||
| Maximum number of shares allowable for issuance | 2,000,000 | |||||||||||||||||||||||
| Options granted | 70,000 | 2,046,000 | 1,921,000 | 125,000 | 70,000 | 50,000 | 225,000 | |||||||||||||||||
| Options granted, exercise price in usd per share | $ 0.80 | $ 0.65 | $ 0.70 | $ 0.80 | $ 0.50 | $ 0.50 | ||||||||||||||||||
| Fair value of options issued | $ 20,223 | $ 508,586 | $ 9,750 | $ 42,065 | ||||||||||||||||||||
| Weighted-average grant date fair value of options granted | $ 0.25 | $ 0.28 | $ 0.29 | $ 0.20 | $ 0.19 | |||||||||||||||||||
| Options repurchased from consultant | 50,000 | |||||||||||||||||||||||
| Options repurchased from consultant, exercise price in usd per share | $ 0.25 | |||||||||||||||||||||||
| Options repurchased from consultant, fair value in usd per ahare | $ 0.80 | |||||||||||||||||||||||
| Options repurchased from consultant, charge to Stockholders' Equity | 12,500 | 12,500 | ||||||||||||||||||||||
| Restricted stock granted | 0 | 200,000 | 0 | 200,000 | ||||||||||||||||||||
| Restricted stock granted, price in usd per share | $ 0.001 | $ 0.001 | ||||||||||||||||||||||
| Award vesting percentage | 25.00% | 25.00% | ||||||||||||||||||||||
| Award vesting period | 4 years | 4 years | 4 years | 6 months | 4 years | 4 years | 180 days | 3 years | ||||||||||||||||
| Award expiration period | 10 years | 10 years | 10 years | 10 years | ||||||||||||||||||||
| Recognized stock-based compensation | 136,184 | 396,724 | 59,361 | 47,648 | ||||||||||||||||||||
| Unvested restricted stock outstanding | 1,596,280 | 1,933,268 | 1,733,268 | 510,000 | 560,000 | 360,000 | ||||||||||||||||||
| Compensation cost related to unvested restricted stock awards and stock option awards not yet recognized | $ 183,230 | $ 537,540 | $ 67,493 | $ 122,056 | ||||||||||||||||||||
| Compensation cost not yet recognized, weighted average period of recognition | 1 year 6 months 22 days | 1 year 8 months 1 day | ||||||||||||||||||||||