XML 36 R26.htm IDEA: XBRL DOCUMENT v3.21.2
Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2021
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights As of September 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 September 30, 2020, we had the following outstanding warrants to purchase shares of common stock:
Number of Underlying SharesExercise PriceExpiration
Investor Warrants497,472$3.3700January 13, 2025
Placement Agent Warrants41,680$4.9940January 13, 2025
539,152
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
September 30,		Nine months ended
September 30,
2021202020212020
Cost of sales$2 $1 $7 $2 
Product development2 3 10 5 
Selling, general, and administrative35 31 370 89 
Total stock-based compensation$39 $35 $387 $96 
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.
Nine months ended
September 30,
20212020
Fair value of options issued$4.18 $2.00 
Exercise price$5.39 $2.61 
Expected life of options (in years)6.26.2
Risk-free interest rate0.8 %0.7 %
Expected volatility96.5 %93.5 %
Dividend yield0.0 %0.0 %
Summary of option activity A summary of option activity under all outstanding stock incentive plans for the nine months ended September 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 
Granted76,900 5.39 
Canceled/forfeited(35,287)5.43 
Expired(1,500)53.50 
Balance at September 30, 2021257,338 $3.49 8.4
Vested and expected to vest at September 30, 2021218,795 $3.43 8.3
Exercisable at September 30, 202178,156 $3.48 7.8
Summary of restricted stock activity A summary of restricted stock unit activity under all outstanding stock incentive plans for the nine months ended September 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(52,080)5.46 
Balance at September 30, 20212,400 $7.14 9.0