Cash, cash equivalents, restricted cash and available-for-sale marketable securities - Cash, Cash Equivalents, and Marketable Securities - (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Amortized Cost Basis [Abstract]
Cash and Cash Equivalents, at Carrying Value	$ 78,329	$ 117,433
Total money market funds and marketable securities	145,524	115,422
Fair Value Disclosure [Abstract]
Total money market funds and marketable securities	145,288	115,411
Unrealized Gain and Loss [Abstract]
Total money market funds and marketable securities	(236)	(11)
Debt securities, unrealized loss position	70,000	15,100
Money market funds
Amortized Cost Basis [Abstract]
Cash and Cash Equivalents, at Carrying Value	75,562	100,305
U.S. Treasury notes
Amortized Cost Basis [Abstract]
Marketable securities, amortized cost	69,962	15,117
Fair Value Disclosure [Abstract]
Marketable securities, fair value	69,727	15,106
Unrealized Gain and Loss [Abstract]
Marketable securities, unrealized losses	$ (236)	$ (11)
Maximum
Unrealized Gain and Loss [Abstract]
Debt securities, contractual maturity period	1 year

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

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Contractual maturity period of a marketable debt security.

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Represents the value of money market funds and marketable securities on amortized cost basis.

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Represents the fair value of money market funds and marketable securities.

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Represents the gross unrealized loss before tax from money market funds and marketable securities.

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