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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock Option and RSU Activity
The following table summarizes stock option and RSU activity, prices, and values from December 31, 2022, to December 31, 2023:
Stock OptionsRestricted Stock Units

Number of
Shares
Available
for
Issuance
Under the
Plan
Number of
Shares*
Weighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Term (in
 Years)
Number
of Shares
Weighted-
Average
Grant
Date Fair
Value
Balance as of December 31, 20221,814,9644,632,093$7.13 6.8758,720$7.14 
Granted(1,923,208)— — —1,923,208$1.06 
Options exercised and RSUs vested151,666—— —(505,201)$6.90 
Forfeited or expired4,718,582(4,599,801)$7.16 —(118,781)$9.11 
Balance as of December 31, 20234,762,00432,292$5.79 5.92,057,946$2.57 
Exercisable as of December 31, 20223,003,687$7.24 6.2
Exercisable as of December 31, 202327,143$5.44 5.8
Unvested as of December 31, 20221,628,406$6.93 8.0
Unvested as of December 31, 20235,149$7.64 6.7
* Of the total 4,599,801 forfeited or expired stock options during 2023, 4,597,539 options were converted into 1,581,571 Restricted Stock Units (RSUs) in July 2023. Refer to the detailed explanation below for more information.
Schedule of Assumptions Used to Value Options Granted
For the years ended December 31, 2023, and 2022, the assumptions used to value the options granted and the resulting weighted-average grant date fair value and stock-based compensation expense were as follows:
Year Ended December 31,
(stock-based compensation in thousands)
20232022
Dividend yieldN/A0 %
Expected volatility
 N/A
 60% - 70%
Expected term (years)
 N/A
 6.0 - 6.5
Risk-free interest rate
 N/A
 1.40% - 2.95%
Weighted average grant date fair valueN/A$1.91 
 
Stock-based compensation—Options$1,559 $3,829 
Stock-based compensation—RSUs$2,440 $2,815 
Total stock-based compensation
$3,999 $6,644 
Schedule of Remaining Unrecognized Compensation Cost
The following table summarizes the total remaining unrecognized compensation cost as of December 31, 2023, related to non-vested options and RSUs, and the weighted average remaining years over which the cost will be recognized:
(in thousands)
Total Unrecognized
Compensation
Cost
Weighted Average
Remaining Years
Stock options$13 0.7
Restricted Stock Units3,112 0.9
Total$3,125