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STOCKHOLDERS' EQUITY (DEFICIT) (Tables)
 3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Summary of Common Stock In addition, the Company had reserved for issuance the following number of shares of common stock for the purposes described below as of March 31, 2021 and December 31, 2020 (in thousands):
March 31, 2021December 31, 2020
Shares of common stock issued171,979 140,450 
Shares of common stock reserved for issuance for:
Warrants1,394 2,247 
Stock options14,380 10,147 
Shares available for grant under 2014 Stock Incentive Plan760 4,863 
Total shares of common stock issued and reserved for issuance188,513 157,707 
Summary of Warrants Outstanding and Warrant Activity The following table sets forth the Company's warrant activity for the three months ended March 31, 2021 (in thousands):
Year-to-Date Warrant Activity
Issued
Exercise
Price (1)
ExpirationDecember 31, 2020Issued(Exercised)(Expired)March 31, 2021
Jun-2019$1.47Jun-2020— — — —— 
Mar-2018$0.55*Mar-20231,705 — (378)— 1,327 
Nov-2017$0.55*Nov-2022487 — (475)— 12 
May-2015$11.83Nov-202428 — — — 28 
Nov-2014$11.04Nov-202427 — — — 27 
2,247 — (853)— 1,394 

* Exercise price shown (i) reflects modification (ii) subject to further adjustment based on down round provision added by amendment described in "Item 15. Exhibits and Financial Statement Schedules - Note. 10 Stockholders' (Deficit) Equity" in the audited annual consolidated financial statements included in its Annual Report on Form 10-K for the year ended December 31, 2020.