Annual report pursuant to Section 13 and 15(d)

Stockholders' equity (Tables)

v3.20.4
Stockholders' equity (Tables) - Tecogen
 12 Months Ended
Dec. 31, 2020
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, 2020 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, 2019 1,352,874 
$0.79-$10.33
 $ 3.57  5.30 years $ 95,381 
Granted 1,440,000 
$0.71-$0.78
 0.72     
Exercised (1,000)
$1.20
 1.20    20 
Canceled and forfeited (295,632)
$1.20-$5.65
 3.42     
Outstanding, December 31, 2020 2,496,242 
$0.71-$10.33
 $ 1.94  7.37 years $ 731,744 
Exercisable, December 31, 2020 828,825    $ 3.61    $ 11,044 
Vested and expected to vest, December 31, 2020 2,246,565    $ 2.04    $ 623,639 
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 2020 and 2019 are as follows:
Stock option awards: 2020 2019
Expected life 6.25 years 6.25 years
Risk-free interest rate 0.41% 2.56%
Expected volatility 40.10% 22.50%