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Investments and fair value measurements
12 Months Ended
Dec. 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 December 31, 2023
Level 1Level 2Level 3
Current assets:
Cash equivalents:
Money market funds$266,692 $— $— 
Marketable securities:
U.S. government securities$— $171,372 $— 
Non-current assets:
Strategic investments$— $— $10,311 
Non-current liabilities:
Cash settled stock appreciation rights$— $— $48 

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 
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 consolidated statements of operations, is as follows (in thousands):

Warrants
Stock Appreciation RightsStrategic Investments
Balance— December 31, 2020
$160 $268 $— 
Exercise of redeemable convertible preferred stock warrants(160)— — 
Vesting and remeasurement of SARs, net of exercises
— 550 — 
Purchases of strategic investments— — 10,000 
Balance— December 31, 2021
— 818 10,000 
Vesting and remeasurement of SARs, net of exercises— (294)— 
Purchases of strategic investments— — 5,000 
Amount reclassified from liability to equity upon exchange— (62)— 
Unrealized loss on strategic investments— — (2,896)
Balance— December 31, 2022
— 462 12,104 
Vesting and remeasurement of SARs— (161)— 
Exercises of SARs— (253)— 
Unrealized loss on strategic investments— — (1,793)
Balance— December 31, 2023
$— $48 $10,311 
During the fiscal year ended December 31, 2021, the remaining outstanding 12,595 warrants to purchase Series A-1 redeemable convertible preferred stock were exercised for an immaterial amount of cash proceeds at an exercise price of $0.196 per share. The Company reclassified the $0.2 million fair value of the warrants into Series A-1 redeemable convertible preferred stock on the consolidated balance sheet. The change in fair value of the warrants during fiscal year ended December 31, 2021 was immaterial.
The Company evaluates its strategic investments 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. The Company determined impairment indicators existed as of June 30, 2023, and the fair value of its strategic investments was less than their carrying value. There were no other remeasurement events for the Company's strategic investments for the remainder of 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.