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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2021
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights
As of June 30, 2021, we had the following outstanding warrants to purchase shares of common stock:
Number of Underlying SharesExercise PriceExpiration
Investor Warrants269,180$3.3700January 13, 2025
Placement Agent Warrants41,680
$4.9940
January 13, 2025
310,860
As of June 30, 2020, we had the following outstanding warrants to purchase shares of common stock:
Number of Underlying SharesExercise PriceExpiration
Investor Warrants673,361$3.3700January 13, 2025
Placement Agent Warrants48,185$4.9940January 13, 2025
721,546
Summary of stock-based compensation expense
The following table summarizes stock-based compensation expense and the impact it had on operations for the periods presented (in thousands):
Three months ended
June 30,
Six months ended
June 30,
2021202020212020
Cost of sales$$— $$
Product development
Selling, general, and administrative203 40 335 58 
Total stock-based compensation$208 $41 $348 $61 
Schedule of valuation assumptions Estimates utilized in the calculation include the expected life of the option, risk-free interest rate, and expected volatility, and are further detailed below.
Six months ended
June 30,
20212020
Fair value of options issued$4.24 $1.18 
Exercise price$5.48 $1.55 
Expected life of options (in years)6.26.2
Risk-free interest rate0.8 %0.8 %
Expected volatility96.4 %92.9 %
Dividend yield0.0 %0.0 %
Summary of option activity
A summary of option activity under all outstanding stock incentive plans for the six months ended June 30, 2021 is presented as follows:
Number of
Options
Weighted
Average
Exercise
Price Per
Share
Weighted
Average
Remaining
Contractual
Life (in years)
Balance at December 31, 2020221,450 $3.45 
Granted73,420 5.48 
Canceled/forfeited(20,922)4.15 
Expired(1,500)53.50 
Balance at June 30, 2021269,723 $3.68 8.6
Vested and expected to vest at June 30, 2021222,177 $3.65 8.5
Exercisable at June 30, 202170,065 $4.07 7.9
Summary of restricted stock activity A summary of restricted stock unit activity under all outstanding stock incentive plans for the six months ended June 30, 2021 is presented as follows:
Restricted
Stock Units
Weighted
Average
Grant
Date
Fair Value
Weighted
Average
Remaining
Contractual
Life (in years)
Balance at December 31, 20204,480 $8.64 
Granted50,000 5.26 
Vested(51,280)5.44 
Balance at June 30, 20213,200 $7.14 9.2