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FAIR VALUE MEASUREMENTS (Tables)
9 Months Ended
Sep. 30, 2024
FAIR VALUE MEASUREMENTS:  
Schedule of Assets Measured at Fair Value on a Recurring Basis (in Thousands):

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Fair Value Measurements Using

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Quoted

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​

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Prices in

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​

​

​

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​

​

​

​

​

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Active

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Significant

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​

​

​

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​

​

​

Markets for

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Other

​

​

​

​

​

​

​

​

Identical

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Observable

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Significant

​

​

September 30, 

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Assets

​

Inputs

​

Unobservable

Assets

    

2024

    

(Level 1)

    

(Level 2)

    

Inputs (Level 3)

Cash equivalents

 

​

  

 

​

  

 

​

  

 

​

  

Money market mutual funds

​

$

80,830

​

$

80,830

​

$

—

​

$

—

Short-term investments (available-for-sale debt securities)

​

 

  

​

 

  

​

 

  

​

 

  

U.S. Government securities (1)

​

 

23,724

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23,724

​

 

—

​

 

—

Non-current assets

​

​

​

​

​

​

​

​

​

​

​

​

Convertible note receivable (available-for-sale debt security) (2)

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​

2,013

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​

—

​

​

—

​

​

2,013

Total

​

$

106,567

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$

104,554

​

$

—

​

$

2,013

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​

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Fair Value Measurements Using

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Quoted

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Prices in

​

​

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​

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​

​

​

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Active

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Significant

​

​

​

​

​

​

​

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Markets for

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Other

​

Significant

​

​

​

​

​

Identical

​

Observable

​

Unobservable

​

​

December 31, 

​

Assets

​

Inputs

​

Inputs 

Assets

    

2023

    

(Level 1)

    

(Level 2)

    

(Level 3)

Cash equivalents

 

​

  

 

​

  

 

​

  

 

​

  

Money market mutual funds

​

$

83,810

​

$

83,810

​

$

—

​

$

—

Short-term investments (available-for-sale debt securities)

​

​

  

​

 

  

​

 

  

​

 

  

U.S. Government securities (1)

​

​

36,544

​

 

36,544

​

 

—

​

 

—

Total

​

$

120,354

​

$

120,354

​

$

—

​

$

—

(1)As of September 30, 2024, and December 31, 2023, the amortized cost of the Company’s investments in U.S. Government securities approximated their fair value due to their short-term maturities, and there have been no events or changes in circumstances that would have had a significant effect on the fair value of these securities in the periods presented. For the three and nine months ended September 30, 2024, there were no material realized or unrealized gains or losses, either individually or in the aggregate.
(2)In August 2024, the Company purchased a $2.0 million non-marketable convertible promissory note from an unrelated third party (the “convertible note”). The convertible note bears a 5% interest rate annually and will mature in August 2026 and is included in other non-current assets in the accompanying condensed consolidated balance sheet as of September 30, 2024. As of September 30, 2024, the cost of the convertible note approximated its fair value as there have been no events or changes in circumstances that would have had a significant effect on its fair value from its issuance date to reporting period end.