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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights As of September 30, 2023 and 2022, we had the following outstanding warrants:
As of September 30, 2023
As of September 30, 2022
Number of Underlying SharesExercise PriceExpiration
June 2022 Warrants384,615384,615$9.10December 16, 2026
December 2021 Warrants182,630182,630$24.64June 7, 2027
January 2020 Investor Warrants26,81926,819$23.59January 13, 2025
January 2020 Placement Agent Warrants5,9545,954$34.96January 13, 2025
600,018600,018
Schedule of Stock-Based Compensation Expense The following table summarizes stock-based compensation expense and the impact it had on operations for the periods presented (in thousands):
Three months ended
September 30,
Nine months ended
September 30,
2023202220232022
Cost of sales$— $— $$
Product development(7)— 16 
Selling, general, and administrative(6)13 35 97 
Total stock-based compensation$(13)$17 $36 $115 
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,
20232022
Fair value of options issued$2.49 $5.39 
Exercise price$3.04 $6.65 
Expected life of options (in years)6.16.1
Risk-free interest rate3.5 %3.0 %
Expected volatility101.8 %104.0 %
Dividend yield0.0 %0.0 %
Schedule of Option Activity A summary of option activity under all outstanding stock incentive plans for the nine months ended September 30, 2023 is presented as follows:
Number of
Options
Weighted
Average
Exercise
Price Per
Share
Weighted
Average
Remaining
Contractual
Life (in years)
Balance at December 31, 202247,103 $13.78 
Granted11,427 3.04 
Canceled/forfeited(21,106)16.80 
Expired(3,827)17.06 
Balance at September 30, 202333,597 $7.85 8.8
Vested and expected to vest at September 30, 202327,864 $8.50 8.7
Exercisable at September 30, 20239,574 $14.94 8.7
*Options have been restated for the 1-for-7 reverse stock split effective June 16, 2023.
Schedule of Restricted Stock Activity A summary of restricted stock unit activity under all outstanding stock incentive plans for the nine months ended September 30, 2023 is presented as follows:
Restricted
Stock Units
Weighted
Average
Grant
Date
Fair Value
Weighted
Average
Remaining
Contractual
Life (in years)
Balance at December 31, 20221,657 $11.13 
Expired(1,428)4.90 
Canceled/forfeited(229)49.99 
Balance at September 30, 2023— $— — 
*Restricted stock units have been restated for the 1-for-7 reverse stock split effective June 16, 2023.