Investments and Fair Value Measurements - Available-for-sale securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Available for sale securities:
Amortized Cost	$ 121,118	$ 303,557
Gross Unrealized Gains		12
Gross Unrealized Losses	(225)	(27)
Estimated Fair Value	120,893	303,542
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	62,318	37,280
Fair value of assets transferred from Level 1 to Level 2	0
Fair value of assets transferred from Level 2 to Level 1	0
Estimated Fair Value Total	62,318	37,280
Gross unrealized lesser than 12 months	(225)	(27)
Gross unrealized loss, Total	(225)	(27)
Marketable securities
Available for sale securities:
Amortized Cost	62,543	83,049
Gross Unrealized Gains		12
Gross Unrealized Losses	(225)	(27)
Estimated Fair Value	62,318	83,034
U.S. government securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	29,510
Estimated Fair Value Total	29,510
Gross unrealized lesser than 12 months	(94)
Gross unrealized loss, Total	(94)
U.S. government securities | Quoted Prices in Active Markets for Identical Assets, Level 1
Available for sale securities:
Amortized Cost	29,604	24,873
Gross Unrealized Gains		8
Gross Unrealized Losses	(94)
Estimated Fair Value	29,510	24,881
U.S. corporate notes
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	28,445
Estimated Fair Value Total	28,445
Gross unrealized lesser than 12 months	(109)
Gross unrealized loss, Total	(109)
U.S. corporate notes | Significant Other Observable Inputs, Level 2
Available for sale securities:
Amortized Cost	28,554
Gross Unrealized Losses	(109)
Estimated Fair Value	28,445
U.S. commercial paper
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months		37,280
Estimated Fair Value Total		37,280
Gross unrealized lesser than 12 months		(27)
Gross unrealized loss, Total		(27)
U.S. commercial paper | Significant Other Observable Inputs, Level 2
Available for sale securities:
Amortized Cost		37,307
Gross Unrealized Losses		(27)
Estimated Fair Value		37,280
U.S. government agency securities
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Estimated Fair Value lesser than 12 months	4,363
Estimated Fair Value Total	4,363
Gross unrealized lesser than 12 months	(22)
Gross unrealized loss, Total	(22)
U.S. government agency securities | Significant Other Observable Inputs, Level 2
Available for sale securities:
Amortized Cost	4,385	20,869
Gross Unrealized Gains		4
Gross Unrealized Losses	(22)
Estimated Fair Value	4,363	20,873
Money market funds | Quoted Prices in Active Markets for Identical Assets, Level 1
Available for sale securities:
Amortized Cost	58,575	220,508
Estimated Fair Value	$ 58,575	$ 220,508