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FAIR VALUE MEASUREMENTS AND INVESTMENT SECURITIES
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS AND INVESTMENT SECURITIES
 
Investment Securities

The following table presents the Company’s investment securities (including, if applicable, those classified on the Company’s balance sheet as cash equivalents) that are measured at fair value on a recurring basis:
Fair Value at June 30, 2020
Fair Value at December 31, 2019
(in thousands)
Level 1
Level 2
 Level 3
Level 1Level 2 Level 3
Cash equivalents:
Money market funds and treasury bills$55,253  $—  $—  $77,170  $—  $—  
Total cash equivalents$55,253  $—  $—  $77,170  $—  $—  
As of June 30, 2020, the $1.5 million of restricted cash, non-current, on the Company's balance sheet is held in a money market fund.

Money market funds, U.S. Treasury, U.S. government agency-backed securities, corporate debt securities and municipal bonds are valued based on various observable inputs such as benchmark yields, reported trades, broker/dealer quotes, benchmark securities and bids.

Warrant Derivative Liability and Private Placement Option Liability

The Company's financial liabilities recorded at fair value on a recurring basis include the fair values of the warrant derivative liability and the private placement option liability. As of June 30, 2020, the fair values of the warrant derivative liability and the private placement option liability are classified as current liabilities in the accompanying condensed consolidated balance sheets. These liabilities will be shown as current liabilities on the balance sheet when it is deemed more probable than not by management to be exercised within one year.
The fair value of the warrants has been estimated with the following weighted-average assumptions:

June 30, 2020December 31, 2019
Risk-free interest rate
0.41 %1.83 %
Volatility of underlying stock price
90.00 %78.67 %
Expected term (years)
6.146.64

The fair value of the private placement option has been estimated with the following weighted-average assumptions:

June 30, 2020
Risk-free interest rate0.59 %
Volatility of underlying stock price90.00 %
Expected term (years)7.00

The following table provides the warrant derivative and private placement option reported at fair value and measured on a recurring basis:

Fair Value at June 30, 2020
Fair Value at December 31, 2019
(in thousands)Level 1Level 2Level 3Level 1Level 2Level 3
Warrant derivative liability$—  $—  $28,183  $—  $—  $52,184  
Private placement option liability—  —  33,970  —  —  12,094  
Total fair value$—  $—  $62,153  $—  $—  $64,278  

The ending balance of the Level 3 financial instruments presented above represents management's best estimate of valuation and may not be substantiated by comparison to independent markets and, in many cases, could not be realized in immediate settlement of the instruments.