Annual report pursuant to Section 13 and 15(d)

Stockholders' equity (Tables)

v3.20.1
Stockholders' equity (Tables) - Tecogen
 12 Months Ended
Dec. 31, 2019
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, 2019 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, 2018
1,292,589

 
$0.79-$10.33
 
$
3.52

 
5.93 years
 
$
671,331

Granted
88,500

 
$3.40-$3.80
 
3.70

 
 
 
 

Exercised
(24,515
)
 
$1.20-$2.60
 
1.37

 
 
 
19,794

Canceled and forfeited
(3,700
)
 
$3.22-$4.50
 
3.46

 
 
 
 

Outstanding, December 31, 2019
1,352,874

 
$0.79-$10.33
 
$
3.57

 
5.30 years
 
$
95,381

Exercisable, December 31, 2019
953,499

 
 
 
$
3.54

 
 
 
$
95,381

Vested and expected to vest, December 31, 2019
1,292,968

 
 
 
$
3.57

 
 
 
$
95,381

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 2019 and 2018 are as follows:
Stock option awards:
 
2019
 
2018
Expected life
 
6.25 years
 
6.25 years
Risk-free interest rate
 
2.56%
 
2.73%
Expected volatility
 
22.50%
 
20.90%