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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights
As of December 31, 2021, we had the following outstanding December 2021 Warrants to purchase shares of common stock:
As of December 31, 2021
Number of Underlying SharesExercise PriceExpiration
Common Warrants1,278,413$3.5200December 16, 2026
Pre-Funded Warrants85,228$0.0001None
1,363,641
As of December 31, 2021 and 2020, we had the following outstanding January 2020 Warrants to purchase shares of common stock:
As of December 31, 2021As of December 31, 2020
Number of Underlying SharesExercise PriceExpiration
Investor Warrants187,734425,626$3.3700January 13, 2025
Placement Agent Warrants41,68041,680$4.9940January 13, 2025
229,414467,306
Summary of Impact of Results of Stock-Based Compensation
The following table summarizes stock-based compensation expense and the impact it had on operations for the periods presented (in thousands):
 For the year ended December 31,
 20212020
Cost of sales$$
Product development14 10 
Selling, general, and administrative406 119 
Total stock-based compensation$429 $131 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions Estimates utilized in the calculation include the expected life of the option, risk-free interest rate, and expected volatility, and are further comparatively detailed as follows:
 20212020
Fair value of options issued$3.92 $2.06 
Exercise price$5.07 $2.68 
Expected life of option (in years)6.26.1
Risk-free interest rate0.9 %0.7 %
Expected volatility96.3 %93.6 %
Dividend yield0.00 %0.00 %
Summary of Option Activity A summary of option activity under all plans was as follows:
 Number of
Options
Weighted
Average
Exercise Price
Per Share
Outstanding at December 31, 2019155,031 $5.23 
Granted112,350 2.68 
Cancelled(33,774)9.56 
Exercised(12,157)2.11 
Outstanding at December 31, 2020221,450 $3.45 
Granted88,240 5.07 
Cancelled(36,706)5.35 
Expired(1,650)49.18 
Exercised(4,225)1.96 
Outstanding at December 31, 2021267,109 $3.46 
Vested and expected to vest at December 31, 2021231,462 $3.41 
Exercisable at December 31, 202192,121 $3.28 
Schedule of Options Outstanding
The options outstanding at December 31, 2021 have been segregated into ranges for additional disclosure as follows:
OPTIONS OUTSTANDINGOPTIONS EXERCISABLE
Range of Exercise Prices
Number of Shares OutstandingWeighted Average Remaining Contractual Life (in years)Weighted Average Exercise PriceNumber of Shares ExercisableWeighted Average Remaining Contractual Life (in years)Weighted Average Exercise Price
$1.45$1.6869,377 8.2$1.49 27,078 8.1$1.49 
$1.69$2.2079,975 7.52.10 43,900 7.52.10 
$2.21$5.4238,406 8.62.77 11,046 7.82.46 
$5.43$5.8158,474 9.15.55 319 7.45.52 
$5.82$29.7520,877 7.510.69 9,778 6.114.40 
   267,109 8.2$3.46 92,121 7.6$3.28 
Summary of Restricted Stock Activity
The following table shows a summary of restricted stock unit activity:
 Restricted Stock Units OutstandingWeighted
Average
Grant Date
Fair Value
At December 31, 20196,603 $13.17 
Granted19,200 2.44 
Vested(20,068)3.96 
Forfeited(1,255)12.40 
At December 31, 20204,480 8.64 
Granted50,000 5.26 
Vested(52,080)5.46 
At December 31, 20212,400 $7.14