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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award The following table contains information about the Company's equity incentive plans as of March 31, 2022:
Awards Reserved for IssuanceAwards ExercisedAwards OutstandingAwards Available for Grant
2016 Equity Incentive Plan999,906 — 499,953 499,953 
2018 Equity Incentive Plan30,159,437 4,080,088 14,009,842 12,069,507 
2019 Equity Incentive Plan101,475,719 54,383 73,014,714 28,406,622 
Share-based Payment Arrangement, Option, Activity
The following table summarizes the Company’s stock option activity and related information for the three months ended March 31, 2022:
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 January 1, 202288,251,380$0.20 
Exercised(146,212)$0.08 
Forfeited(223,788)$0.15 
Expired(29,762)$0.34 
Options outstanding as of March 31, 2022
87,851,618$0.20 8.5 years$526 
Options exercisable as of March 31, 2022
41,296,676$0.26  7.4 years $1,338 
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 shares / options)
 For the Three Months Ended
 March 31, 2022March 31, 2021
Type of Award Number of
Shares or
Options
Granted		Stock-Based
Compensation
Expense 		Number of
Shares or
Options
Granted		Stock-Based
Compensation
Expense
 
Stock options114,006,195$1,821 500,000$244 
Stock grants:
Employees (common stock)900,000 $182 —— 
Directors (common stock)683,332$184 541,666121 
Non–employee consultants (common stock)—$— 332,94733 
Total stock–based compensation expense$2,187 $398