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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Fair Values of Stock Options Granted, Estimated Using Black-Scholes Option Valuation Model Assumptions The fair values of stock options granted for the years were estimated using the following assumptions:
 Option Grants Awarded During the Year Ended December 31, 2021Option Grants Awarded During the Year Ended December 31, 2020
Stock Price
$5.31
$1.74 to $2.85
Dividend Yield0%0%
Expected Volatility
88%
70% to 83%
Risk-free interest rate
0.72%
0.36% to 1.52%
Expected Term7 years7 years
Summary of Stock Option Activity
The following is a summary of our stock option activity during the year ended December 31, 2021:
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Grant Date
Fair Value		Weighted
Average
Remaining
Life In
Years
Outstanding, January 1, 20211,140,975 $4.46 $2.81 5.69
Granted5,000 5.31 4.04 9.04
Exercised(105,098)2.79 1.69 — 
Canceled/Forfeited(95,801)4.90 3.02 — 
Outstanding, December 31, 2021945,076 $4.60 $2.92 4.68

Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Grant Date
Fair Value		Weighted
Average
Remaining
Life In
Years
Exercisable, January 1, 2021955,302 $4.74 $2.96 5.10
Vested74,198 3.44 2.32 6.66
Exercised(105,098)2.79 1.69 — 
Canceled/Forfeited(75,192)5.55 3.35 — 
Exercisable, December 31, 2021849,210 $4.79 $3.02 4.32
Schedule of Share-based Compensation, Restricted Stock Units Award Activity A summary of restricted stock unit activity for the year ended December 31, 2021 is as follows:
 Number of
Restricted Share
Units		Weighted-Average
Grant-Date Fair
Value Per Share
Outstanding at January 1, 20213,038,785 $2.53 
Granted2,851,443 4.38 
Vested(2,173,829)3.51 
Forfeited(289,771)3.88 
Outstanding at December 31, 20213,426,628 $3.44 

A summary of restricted stock unit activity for the year ended December 31, 2020 is as follows:
 Number of
Restricted Share
Units		Weighted-Average
Grant-Date Fair
Value Per Share
Outstanding at January 1, 20202,556,004 $3.38 
Granted3,091,206 2.04 
Vested(2,183,163)2.82 
Forfeited(425,262)2.57 
Outstanding at December 31, 20203,038,785 $2.53 
Schedule of Stock-Based Compensation
Total stock-based compensation recorded in the consolidated statements of comprehensive loss is allocated as follows (in thousands): 
 Year Ended December 31, 2021Year Ended December 31, 2020
 
Research and development$3,779 $2,753 
Sales, marketing and administration4,175 3,071 
Total stock-based compensation$7,954 $5,824