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MARKETABLE SECURITIES AND FAIR VALUE MEASUREMENTS (Tables)
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Marketable Debt Securities
Marketable debt securities as of September 30, 2021 consisted of the following (in thousands):

September 30, 2021
Amortized
Cost		Unrealized Holding GainsUnrealized Holding LossesFair Value
Corporate debt securities6,935 531 — 7,466 
$6,935 $531 $— $7,466 
The amortized costs and fair value of our marketable debt securities, by contractual maturity, as of September 30, 2021 (in thousands) are as follows:

September 30, 2021

Amortized
Cost		Fair
Value
Less than 1 year$— $— 
1 to 5 years6,935 7,466 
Total$6,935 $7,466 
Marketable Equity Securities
Marketable equity securities as of September 30, 2021 consisted of the following (in thousands):


September 30, 2021
Initial CostsCumulative Unrealized Holding GainsFair Value
Equity securities$27,538 $490 $28,028 
$27,538 $490 $28,028 
Schedule of financial instruments measured at fair value on recurring basis
Financial instruments measured at fair value on a recurring basis as of September 30, 2021 and December 31, 2020 are classified based on the valuation technique in the table below (in thousands):

 September 30, 2021 
Fair Value Measurements Using
Quoted Prices
 in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
Assets:
Equity securities$28,028 $— $— $28,028 
Corporate debt securities— 7,466 — 7,466 
Total assets at fair value$28,028 $7,466 $— $35,494 
Liabilities
Derivative instruments$— $1,759 $— $1,759 
Total liabilities at fair value$— $1,759 $— $1,759 

 
 December 31, 2020 
Fair Value Measurements Using
Quoted Prices 
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)		Total
Assets:
Money market accounts (1)
45,614 $— $— $45,614 
Total assets at fair value $45,614 $— $— $45,614 
(1) The above table excludes $13.9 million of cash held in banks.
Realized and Unrealized Gains and Losses From Our Equity Securities and Derivative Instruments
A summary of realized and unrealized gains and losses from our equity securities and derivative instruments are as follows (in thousands):

Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Net unrealized gains (losses) recognized on equity investments held as of the end of the period$490 $— $490 $— 
Net realized gains (losses) recognized on derivative instruments9 — 9 — 
Net unrealized gains (losses) recognized on derivative instruments(2)— $(2)— 
Total net gains (losses) recognized in Interest and other income (loss), net$497 $— $497 $— 
Derivatives Not Designated as Hedging Instruments These derivative instruments are reported as Other current liabilities on our Condensed Consolidated Balance Sheets.

Cost		Unrealized Holding LossesFair Value
Liabilities
Derivative instruments$1,757 $2 $1,759 
$1,757 $2 $1,759