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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020Option Grants Awarded During the Year Ended December 31, 2019
Stock Price
$1.74 to $2.85
$1.52 to $3.26
Dividend Yield0%0%
Expected Volatility
70% to 83%
70%
Risk-free interest rate
0.36% to 1.52%
1.47% to 2.62%
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, 2020:
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Grant Date
Fair Value		Weighted
Average
Remaining
Life In
Years
Outstanding, January 1, 20201,340,252 $4.57 $2.88 6.95
Granted105,500 2.33 1.68 8.64
Exercised(5,939)1.90 1.28 — 
Canceled/Forfeited(298,838)4.25 2.76 — 
Outstanding, December 31, 20201,140,975 $4.46 $2.81 5.69
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Grant Date
Fair Value		Weighted
Average
Remaining
Life In
Years
Exercisable, January 1, 2020989,092 $4.85 $3.03 6.37
Vested122,030 3.74 2.4 5.53
Exercised(5,939)1.90 1.28 — 
Canceled/Forfeited(149,881)4.79 3.06 — 
Exercisable, December 31, 2020955,302 $4.74 $2.96 5.10
Schedule of Share-based Compensation, Restricted Stock Units Award Activity 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 
A summary of restricted stock unit activity for the year ended December 31, 2019 is as follows:
 Number of
Restricted Share
Units		Weighted-Average
Grant-Date Fair
Value Per Share
Outstanding at January 1, 20191,921,594 $4.78 
Granted2,115,177 2.78 
Vested(1,317,586)3.92 
Forfeited(163,181)4.19 
Outstanding at December 31, 20192,556,004 $3.38 
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, 2020		Year Ended
December 31, 2019
 
Research and development$2,753 $2,823 
Sales, marketing and administration3,071 2,983 
Total stock-based compensation$5,824 $5,806