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STOCKHOLDERS' EQUITY (Tables)
3 Months Ended
Mar. 31, 2022
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 March 31, 2022 and December 31, 2021 (in thousands):
March 31, 2022December 31, 2021
Shares of common stock issued199,464199,464
Shares of common stock reserved for issuance for:
Warrants199 199 
Stock options16,783 15,703 
Restricted stock units4,965 3,041 
Shares available for grant under 2014 Stock Incentive Plan3,564 8,933 
Shares available for sale under 2014 Employee Stock Purchase Plan2,300 2,300 
Total shares of common stock issued and reserved for issuance227,275 229,640 
Summary of Warrants Outstanding and Warrant Activity The following table sets forth the Company's warrant activity for the three months ended March 31, 2022 (in thousands):
IssuedExercise
Price
ExpirationDecember 31, 2021Issued(Exercised)(Cancelled)March 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    199 
* Exercise price shown (i) reflects modification and (ii) is subject to further adjustment based on down round provision added by amendment described in “Item 15. Exhibits and Financial Statement Schedules - Note. 12 Stockholders’ Equity (Deficit)” in the audited annual consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2021.