Annual report pursuant to Section 13 and 15(d)

Stockholders' equity (Tables)

v3.22.0.1
Stockholders' equity (Tables) - Tecogen
 12 Months Ended
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Stock Option Activity
Stock option activity for the year ended December 31, 2021 was as follows:
Common Stock Options Number of
Options		 Exercise
Price
Per
Share		 Weighted
Average
Exercise
Price		 Weighted
Average
Remaining
Life		 Aggregate
Intrinsic
Value
Outstanding, December 31, 2020 2,496,242  $ 0.71  — $10.33 $ 1.94  7.37 years $ 731,744 
Granted 258,000  $1.75 1.75 
Exercised —  —
Canceled and forfeited (367,400) $ 0.08  — $4.50 2.70 
Outstanding, December 31, 2021 2,386,842  $ 0.71  — $10.33 $ 1.81  7.56 years $ 697,935 
Exercisable, December 31, 2021 719,633  $ 3.53  $ 71,785 
Vested and expected to vest, December 31, 2021 2,136,731  $ 1.89  $ 604,012 
Summary of Weighted Average Assumptions Used in Black-Scholes Option Pricing
The weighted average assumptions used in the Black-Scholes option pricing model for options granted in 2021 and 2020 are as follows:
Stock option awards: 2021 2020
Expected life 6.25 years 6.25 years
Risk-free interest rate 1.09% 0.41%
Expected volatility 35.86% 40.10%