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FAIR VALUE MEASUREMENTS AND INVESTMENT SECURITIES
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS AND INVESTMENT SECURITIES 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 as of September 30, 2021 and December 31, 2020:
Fair Value at September 30, 2021
Fair Value at December 31, 2020
(in thousands)
Level 1
Level 2
 Level 3
Level 1Level 2 Level 3
Cash equivalents:
Money market funds and treasury bills$12,481 $— $— $27,463 $— $— 
Total cash equivalents$12,481 $— $— $27,463 $— $— 
As of September 30, 2021 and December 31, 2020, $1.5 million of restricted cash 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 September 30, 2021, 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.

Inputs used to determine estimated fair value (Level 3) of the warrants include the fair value of the underlying stock relative to the warrant exercise price at the valuation measurement date, volatility of the price of the underlying stock, the expected term of the warrants, and risk-free interest rates.

The fair value of the warrants has been estimated with the following weighted-average assumptions, including the most sensitive input, volatility:

September 30, 2021December 31, 2020
Risk-free interest rate
0.95%0.46%
Volatility
95.00%90.00%
Expected term (years)
4.895.64

Inputs used to determine estimated fair value (Level 3) of the private placement option include the fair value of the underlying stock relative to the preferred share conversion price and warrant exercise price at the valuation measurement date, volatility of the price of the underlying stock, the expected term of the call option on the preferred shares and expected term of the warrants, and risk-free interest rates.
The fair value of the private placement option has been estimated with the following weighted-average assumptions, including the most sensitive input, volatility:
September 30, 2021December 31, 2020
Risk-free interest rate1.33 %0.77 %
Volatility95.00 %90.00 %
Expected term (years)7.007.00

The following table provides the warrant derivative and private placement option reported at fair value and measured on a recurring basis:
Fair Value at September 30, 2021
Fair Value at December 31, 2020
(in thousands)Level 1Level 2Level 3Level 1Level 2Level 3
Warrant derivative liability$— $— $7,842 $— $— $10,345 
Private placement option liability— — 2,800 — — 7,803 
Total fair value$— $— $10,642 $— $— $18,148 

The ending balance of the Level 3 financial instruments presented above represents the Company'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.