Marketable Securities - Amortized cost (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Total available-for-sale securities	$ 259,224	$ 284,172
Unrealized Gains (Losses)
Unrealized Gains	36	265
Unrealized Losses	(282)	(70)
Fair Value
Marketable securities	258,978	284,367
One Year or Less
Amortized Cost
Total securities with a maturity of one year or less	210,862	260,966
Unrealized Gains (Losses)
Unrealized Gains	7	127
Unrealized Losses	(117)	(70)
Fair Value
Total securities with a maturity of one year or less	210,752	261,023
One to Two Years
Amortized Cost
Total securities with a maturity of more than one year	48,362	23,206
Unrealized Gains (Losses)
Unrealized Gains	29	138
Unrealized Losses	(165)	0
Fair Value
Total securities with a maturity of more than one year	48,226	23,344
U.S. government agency securities and treasuries | One Year or Less
Amortized Cost
Total securities with a maturity of one year or less	195,594	235,500
Unrealized Gains (Losses)
Unrealized Gains	4	127
Unrealized Losses	(84)	(41)
Fair Value
Total securities with a maturity of one year or less	195,514	235,586
U.S. government agency securities and treasuries | One to Two Years
Amortized Cost
Total securities with a maturity of more than one year	38,641	15,537
Unrealized Gains (Losses)
Unrealized Gains	0	45
Unrealized Losses	(155)	0
Fair Value
Total securities with a maturity of more than one year	38,486	15,582
Corporate debt securities | One Year or Less
Amortized Cost
Total securities with a maturity of one year or less	15,268	25,466
Unrealized Gains (Losses)
Unrealized Gains	3	0
Unrealized Losses	(33)	(29)
Fair Value
Total securities with a maturity of one year or less	15,238	25,437
Corporate debt securities | One to Two Years
Amortized Cost
Total securities with a maturity of more than one year	9,721	7,669
Unrealized Gains (Losses)
Unrealized Gains	29	93
Unrealized Losses	(10)	0
Fair Value
Total securities with a maturity of more than one year	$ 9,740	$ 7,762