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STOCKHOLDERS' EQUITY (DEFICIT) (Tables)
6 Months Ended
Jun. 30, 2020
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, 2020 and December 31, 2019 (in thousands):
June 30, 2020December 31, 2019
Shares of common stock issued116,628  106,801  
Shares of common stock reserved for issuance for:
Warrants2,485  22,895  
Stock options9,990  6,236  
Shares available for grant under 2014 Stock Incentive Plan5,084  8,753  
Shares available for sale under 2014 Employee Stock Purchase Plan25  28  
Total shares of common stock issued and reserved for issuance134,212  144,713  
Summary of Warrants Outstanding and Warrant Activity The following table sets forth the Company's warrant activity for the six months ended June 30, 2020 (in thousands):
Year-to-Date Warrant Activity
Issued
Exercise
Price (1)
ExpirationDecember 31, 2019Issued(Exercised)(Expired)June 30, 2020
Jun-2019$1.47Jun-202020,410  —  —  (20,410)—  
Mar-2018$0.55*Mar-20231,943  —  —  —  1,943  
Nov-2017$0.55*Nov-2022487  —  —  —  487  
May-2015$11.83Nov-202428  —  —  —  28  
Nov-2014$11.04Nov-202427  —  —  —  27  
22,895  —  —  (20,410) 2,485  
(1) As of June 30, 2020.
* Exercise price shown subject to further adjustment based on down round provision added by amendment.