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STOCKHOLDERS’ EQUITY (Tables)
 3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights
As of March 31, 2024 and December 31, 2023, we had the following outstanding warrants:
As of
March 31, 2024
As of
December 31, 2023
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$34.96January 13, 2025
600,018 600,018
Summary of Stock-based Compensation Expense
The following table summarizes stock-based compensation expense and the impact it had on operations for the periods presented (in thousands):
Three months ended
March 31,
20242023
Cost of sales$— $— 
Product development— 4 
Selling, general, and administrative1 22 
Total stock-based compensation$1 $26 
Summary of Option Activity A summary of option activity under all plans for the three months ended March 31, 2024 was as follows:
Number of
Options		Weighted
Average
Exercise
Price Per
Share		Weighted
Average
Remaining
Contractual
Life (in years)
Balance at December 31, 202330,575 $5.60 
Granted— — 
Canceled/forfeited— — 
Expired(9)53.33 
Balance at March 31, 202430,566 $5.58 8.5
Vested and expected to vest at March 31, 202426,469 $5.72 8.4
Exercisable at March 31, 20249,625 $7.52 8.1