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STOCKHOLDERS' EQUITY DEFICIT (Tables)
12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Schedule of Common Stock In addition, the Company had reserved for issuance the following amounts of shares of its common stock for the purposes described below as of December 31, 2022 and 2021 (in thousands):
December 31,
20222021
Shares of common stock issued202,759199,464
Shares of common stock reserved for issuance for:
Warrants187 199 
Stock options15,304 15,703 
RSUs4,695 3,041 
Shares available for grant under 2014 Stock Incentive Plan4,532 8,933 
Shares available for sale under 2014 Employee Stock Purchase Plan2,300 2,300 
Total shares of common stock issued and reserved for issuance229,777 229,640 
Schedule of Warrants Outstanding and Warrant Activity The following table sets forth the Company's warrant activity for the year ended December 31, 2022 (in thousands):
IssuedExercise
Price
ExpirationDecember 31, 2021Issued(Exercised)(Cancelled)December 31, 2022
Mar-2018$0.55*Mar-2023132 — — — 132 
Nov-2017$0.55*Nov-202212 — — (12)— 
May-2015$11.83Nov-202428 — — — 28 
Nov-2014$11.04Nov-202427 — — — 27 
199   (12)187 
* Exercise price shown (i) reflects modification described below and (ii) subject to further adjustment based on down round provision added by amendment described below.