Cash, cash equivalents, restricted cash and available-for-sale marketable securities - Cash, cash equivalents, and marketable securities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
Cash and cash equivalents	$ 244,293	$ 98,959
Total money market funds and marketable securities	266,892	111,704
Debt securities, unrealized loss position	11,200	19,900
Debt securities, unrealized gain position	7,900	0
Fair Value
Total money market funds and marketable securities	266,887	111,613
Unrealized Gains and Losses
Marketable securities, unrealized gains	1
Marketable securities, unrealized losses	$ (6)	(91)
Maximum
Amortized Cost
Debt securities, contractual maturity period	1 year
Money market funds
Amortized Cost
Cash and cash equivalents	$ 238,434
Fair Value
Cash and cash equivalents	238,434	91,724
U.S. Treasury notes
Amortized Cost
Marketable securities, amortized cost	12,754	19,980
Fair Value
Marketable securities, fair value	12,754	19,889
Unrealized Gains and Losses
Marketable securities, unrealized gains	1
Marketable securities, unrealized losses	(1)	$ (91)
U. S. Government agency securities
Amortized Cost
Marketable securities, amortized cost	4,321
Fair Value
Marketable securities, fair value	4,317
Unrealized Gains and Losses
Marketable securities, unrealized losses	(4)
Corporate bonds
Amortized Cost
Marketable securities, amortized cost	1,976
Fair Value
Marketable securities, fair value	1,975
Unrealized Gains and Losses
Total money market funds and marketable securities	(1)
Commercial paper
Amortized Cost
Marketable securities, amortized cost	9,407
Fair Value
Marketable securities, fair value	$ 9,407