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STOCKHOLDERS' EQUITY (Tables)
6 Months Ended
Jun. 30, 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 June 30, 2022 and December 31, 2021 (in thousands):
June 30, 2022December 31, 2021
Shares of common stock issued199,464199,464
Shares of common stock reserved for issuance for:
Warrants199 199 
Stock options17,161 15,703 
Restricted stock units8,063 3,041 
Shares available for grant under 2014 Stock Incentive Plan3,076 8,933 
Shares available for sale under 2014 Employee Stock Purchase Plan2,300 2,300 
Total shares of common stock issued and reserved for issuance230,263 229,640 
Summary of Warrants Outstanding and Warrant Activity The following table sets forth the Company's warrant activity for the three months ended June 30, 2022 (in thousands):
IssuedExercise
Price
ExpirationDecember 31, 2021Issued(Exercised)(Cancelled)June 30, 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.