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Summary of significant accounting policies (Tables)
3 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]  
Schedule of Cash, Cash Equivalents, and Restricted Cash
As of March 31,
As of December 31,
Reconciliation of cash, cash equivalents and restricted cash20222021
Cash and cash equivalents$510,965 $533,868 
Restricted cash, non-current3,629 2,900 
Total cash, cash equivalents and restricted cash$514,594 $536,768 
Restrictions on Cash and Cash Equivalents
As of March 31,
As of December 31,
Reconciliation of cash, cash equivalents and restricted cash20222021
Cash and cash equivalents$510,965 $533,868 
Restricted cash, non-current3,629 2,900 
Total cash, cash equivalents and restricted cash$514,594 $536,768 
Accounts Receivable, Allowance for Credit Loss
Balance at Beginning of PeriodCharged to ExpensesCharges Utilized/Written-offBalance at End of Period
Allowance for doubtful accounts
Three Months Ended March 31, 2022$678 $110 $(110)$678 
Three Months Ended March 31, 2021$643 $$(26)$620 
Fair Value, Assets Measured on Recurring Basis
The fair value measurements of assets that are measured at fair value on a recurring basis are as follows (in thousands):

Fair Value Hierarchy
Level 1Level 2Level 3
March 31, 2022
Strategic investments$— $— $15,000 
Total as of March 31, 2022
$— $— $15,000 
Fair Value, Liabilities Measured on Recurring Basis
The fair value measurements of liabilities that are measured at fair value on a recurring basis are as follows (in thousands):

Fair Value Hierarchy
Level 1Level 2Level 3
March 31, 2022
Cash settled stock appreciation rights$— $— $508 
Total as of March 31, 2022
$— $— $508 
March 31, 2021
Cash settled stock appreciation rights$— $— $674 
Total as of March 31, 2021
$— $— $674 
Summary of the Changes in the Fair Value of Level 3 Financial Instruments
A summary of the changes in the fair value of Level 3 financial instruments, of which remeasurement of stock appreciation rights are recognized in the condensed consolidated statements of operations, is as follows (in thousands):

WarrantsStock Appreciation RightsStrategic Investments
Balance— December 31, 2021
$— $818 $10,000 
Vesting and remeasurement of stock appreciation rights— (310)— 
Purchases of strategic investments— — 5,000 
Balance— March 31, 2022
$— $508 $15,000 
Balance— December 31, 2020
$160 $268 $— 
Exercise of redeemable convertible preferred stock warrants(160)— — 
Vesting and remeasurement of stock appreciation rights— 406— 
Balance— March 31, 2021
$— $674 $— 
Summary of the Changes in the Fair Value of Level 3 Financial Instruments
A summary of the changes in the fair value of Level 3 financial instruments, of which remeasurement of stock appreciation rights are recognized in the condensed consolidated statements of operations, is as follows (in thousands):

WarrantsStock Appreciation RightsStrategic Investments
Balance— December 31, 2021
$— $818 $10,000 
Vesting and remeasurement of stock appreciation rights— (310)— 
Purchases of strategic investments— — 5,000 
Balance— March 31, 2022
$— $508 $15,000 
Balance— December 31, 2020
$160 $268 $— 
Exercise of redeemable convertible preferred stock warrants(160)— — 
Vesting and remeasurement of stock appreciation rights— 406— 
Balance— March 31, 2021
$— $674 $—