Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Stock Option Activity (Details)

v3.22.2
Stock-Based Compensation - Stock Option Activity (Details) - Tecogen - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2020
Jun. 30, 2022
Dec. 31, 2021
Stock Options Outstanding [Roll Forward]        
Beginning (shares) 2,386,842   2,386,842  
Granted (shares)     851,650  
Exercised (shares)     0  
Canceled and forfeited (shares)     (28,400)  
Ending (shares)     3,210,092  
Exercisable (shares)     1,303,217  
Vested and expected to vest (shares)     2,924,061  
Exercise Price Per Share [Abstract]        
Exercise Price Per Share, Outstanding, Minimum (per share) $ 0.71   $ 0.71  
Exercise Price Per Share, Outstanding, Maximum (dollars per share) 10.33   10.33  
Weighted Average Exercise Price [Roll Forward]        
Beginning (usd per share) $ 1.81   1.81  
Granted (usd per share)     1.11  
Canceled and forfeited (usd per share)     1.53  
Ending (usd per share)     1.63  
Exercisable (usd per share)     2.47  
Vested and expected to vest (usd per share)     $ 1.68  
Weighted Average Remaining Life   7 years 6 months 21 days 7 years 8 months 23 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Outstanding, Aggregate Intrinsic Value     $ 617,001 $ 697,935
Exercisable, Aggregate Intrinsic Value     249,903  
Vested and expected to vest, Aggregate Intrinsic Value     $ 561,936  
Minimum        
Exercise Price Per Share [Abstract]        
Exercise price per share, Granted (dollars per share)     $ 1.10  
Exercise Price, Canceled and Forfeited (dollars per share)     1.10  
Maximum        
Exercise Price Per Share [Abstract]        
Exercise price per share, Granted (dollars per share)     1.20  
Exercise Price, Canceled and Forfeited (dollars per share)     $ 4.50