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STOCKBASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award The following table contains information about both plans as of December 31, 2021:
Awards
Reserved
for Issuance		Awards
Exercised		Awards
Outstanding		Awards
Available
for Grant
2016 Equity Incentive Plan2,000,000 — 499,953 1,500,047 
2018 Equity Incentive Plan43,976,425 3,875,921 14,409,604 25,690,900 
2019 Equity Incentive Plan84,150,000 34,884 73,014,717 11,100,399 
The service period is generally the vesting period. The following weighted-average assumptions were used to calculate stock-based compensation:
Year Ended December 31,
20212020
Expected term5 years6 years
Volatility106.7 %104.6 %
Risk-Free Interest Rate0.8 %0.4 %
Dividend Yield0 %0 %
Share-based Payment Arrangement, Option, Activity
The following table summarizes the Company’s stock option activity and related information for the year ended December 31, 2021 and 2020:
Number
of Shares		Weighted-
Average
Exercise
Price
Per Share		Weighted-
Average
Remaining Contractual
Life		Aggregate
Intrinsic
Value of In-
the-Money
Options
Options Outstanding as of December 31, 201912,365,295 $1.61 
Options Granted12,803,918 $0.08 
Options Exercised— $— 
Options Forfeited(7,203,334)$1.19 
Options Expired(473,049)$1.51 
Options Outstanding as of December 31, 202017,492,830 $0.41 
Options Granted88,627,220 $0.23 
Options Exercised(3,910,805)$0.08 
Options Forfeited(13,547,745)$0.15 
Options Expired(410,120)$0.41 
Options Outstanding as of December 31, 202188,251,380 $0.20 8.8 years$10,334,294 
Options Exercisable as of December 31, 202135,661,302 $0.27 7.6 years$3,591,052 
Share-based Payment Arrangement, Activity
The following table sets forth the total stock-based compensation expense resulting from stock options and restricted grants of common stock to employees, directors and non-employee consultants in the consolidated statement of operations which are included in selling, general and administrative expenses:
(in thousands, except for number of shares or options)
For the Year Ended
December 31, 2021December 31, 2020
Type of AwardNumber of
Shares or
Options
Granted		Stock-Based
Compensation
 Expense		Number of
Shares or
Options
Granted		Stock-
Based
Compensation
Expense
Stock Options89,930,019 $2,415 4,174,428 $1,868 
Stock Grants:
Employees (Common Stock)250,000 68 740,580 142 
Directors (Common Stock)1,917,837 494 173,610 105 
Non–Employee Consultants (Common Stock)4,556,603 1,078 715,065 60 
Total Stock–Based Compensation Expense$4,055 $2,175