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Investments and fair value measurements
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Investments and fair value measurements
4. Investments and fair value measurements

The Company’s assets and liabilities that are measured at fair value on a recurring or nonrecurring basis within the fair value hierarchy are as follows (in thousands):

As of September 30, 2023
Level 1Level 2Level 3
Cash equivalents:
Money market funds$267,036 $— $— 
U.S. government securities— 14,881 — 
Total cash equivalents267,036 14,881 — 
Marketable securities:
U.S. government securities$— $151,466 $— 
Non-current assets:
Strategic investments$— $— $10,311 
Non-current liabilities:
Cash settled stock appreciation rights$— $— $26 

As of December 31, 2022
Level 1Level 2Level 3
Cash equivalents:
Money market funds$130,377 $— $— 
U.S. government securities— 48,900 — 
Total cash equivalents$130,377 $48,900 $— 
Marketable securities:
U.S. government securities$— $151,687 $— 
Non-current assets:
Strategic investments$— $— $12,104 
Non-current liabilities:
Cash settled stock appreciation rights$— $— $462 

The Company’s money market funds are classified within Level 1 of the fair value hierarchy because they are valued using quoted prices in active markets. The Company’s investments in U.S. government securities are classified within Level 2 of the fair value hierarchy because they have been valued using inputs other than quoted prices in active markets that are directly or indirectly observable. The Company’s strategic investment and stock appreciation rights (“SARs”) are classified within Level 3 of the fair value hierarchy because they have been valued using significant unobservable inputs for which the Company has been required to develop its own assumptions.
A summary of the changes in the fair value of Level 3 financial instruments, of which remeasurement of SARs and impairment of strategic investments are recognized in the condensed consolidated statements of operations, is as follows (in thousands):

Stock Appreciation RightsStrategic Investments
Balance— June 30, 2023
$30 $10,311 
Vesting and remeasurement of SARs(4)— 
Balance— September 30, 2023
$26 $10,311 
Balance— June 30, 2022
$419 $15,000 
Vesting and remeasurement of SARs, net of exercises165 — 
Amount reclassified from liability to equity upon exchange(62)— 
Unrealized loss on strategic investments— (2,896)
Balance— September 30, 2022
$522 $12,104 
Balance— December 31, 2022
$462 $12,104 
Vesting and remeasurement of SARs(183)— 
Exercises of SARs(253)— 
Unrealized loss on strategic investments— (1,793)
Balance— September 30, 2023
$26 $10,311 
Balance— December 31, 2021
$818 $10,000 
Vesting and remeasurement of SARs, net of exercises(234)— 
Purchases of strategic investments— 5,000 
Amount reclassified from liability to equity upon exchange(62)— 
Unrealized loss on strategic investments— (2,896)
Balance— September 30, 2022
$522 $12,104 

The Company evaluates its strategic investment for impairment at each reporting period. This evaluation consists of several potential qualitative and quantitative impairment indicators including, but not limited to, the investee's financial metrics, whether there were any significant adverse changes in the economic environment or general market conditions of the geographies and industries in which the investee operates, and any other publicly available information that may affect the value of the investment. No impairment indicators were identified as part of the assessment performed as of September 30, 2023.
The difference between the strategic investment’s cost basis of $15.0 million and the carrying value of $10.3 million is due to cumulative impairment charges of $4.7 million, of which $1.8 million was recorded during the second quarter of 2023, and $2.9 million was recorded during the third quarter of 2022.