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STOCKHOLDERS' EQUITY DEFICIT (Tables)
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Summary 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, 2021 and 2020 (in thousands):
December 31,
20212020
Shares of common stock issued199,464140,450
Shares of common stock reserved for issuance for:
Warrants199 2,247 
Stock options15,703 10,147 
RSUs3,041 — 
Shares available for grant under 2014 Stock Incentive Plan8,933 4,863 
Shares available for sale under 2014 Employee Stock Purchase Plan2,300 — 
Total shares of common stock issued and reserved for issuance229,640 157,707 
Summary of Warrants Outstanding and Warrant Activity The following table sets forth the Company's warrant activity for the year ended December 31, 2021 (in thousands):
IssuedExercise
Price
ExpirationDecember 31, 2020Issued(Exercised)(Cancelled)December 31, 2021
Jun-2019$1.47Jun-2020— — — — — 
Mar-2018$0.55*Mar-20231,705 — (1,573)— 132 
Nov-2017$0.55*Nov-2022487 — (475)— 12 
May-2015$11.83Nov-202428 — — — 28 
Nov-2014$11.04Nov-202427 — — — 27 
2,247  (2,048) 199 
* Exercise price shown (i) reflects modification described below and (ii) subject to further adjustment based on down round provision added by amendment described below.