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Investments and fair value measurements
3 Months Ended
Mar. 31, 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 March 31, 2023
Level 1Level 2Level 3
Cash equivalents:
Money market funds$237,819 $— $— 
Marketable securities:
U.S. government securities$— $169,613 $— 
Non-current assets:
Strategic investments$— $— $12,104 
Current liabilities— accrued compensation and benefits:
Cash settled stock appreciation rights$— $— $243 
Non-current liabilities:
Cash settled stock appreciation rights$— $— $21 

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 are recognized in the condensed consolidated statements of operations, is as follows (in thousands):

Stock Appreciation RightsStrategic Investments
Balance— December 31, 2022
$462 $12,104 
Vesting and remeasurement of SARs(198)— 
Balance— March 31, 2023
$264 $12,104 
Balance— December 31, 2021
$818 $10,000 
Vesting and remeasurement of SARs, net(310)— 
Purchases of strategic investments— 5,000 
Balance— March 31, 2022
$508 $15,000 
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 losses were recorded in the three months ended March 31, 2023. The difference between the strategic investment’s cost basis of $15.0 million and the carrying value of $12.1 million is due to an impairment charge of $2.9 million, which was recorded in the third quarter of 2022.