Fair Value Measurements (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Fair value measurements
Transfer of assets between levels	$ 0	$ 0	$ 0	$ 0
Recurring fair value measurement
Fair value measurements
Total assets at fair value	88,776,000		88,776,000		$ 152,560,000
Recurring fair value measurement | Money market funds
Fair value measurements
Total assets at fair value	88,374,000		88,374,000		105,078,000
Recurring fair value measurement | Certificates of deposit
Fair value measurements
Total assets at fair value	402,000		402,000		401,000
Recurring fair value measurement | U.S. treasury notes
Fair value measurements
Total assets at fair value					47,081,000
Recurring fair value measurement | Level 1
Fair value measurements
Total assets at fair value	88,776,000		88,776,000		152,560,000
Recurring fair value measurement | Level 1 | Money market funds
Fair value measurements
Total assets at fair value	88,374,000		88,374,000		105,078,000
Recurring fair value measurement | Level 1 | Certificates of deposit
Fair value measurements
Total assets at fair value	402,000		402,000		401,000
Recurring fair value measurement | Level 1 | U.S. treasury notes
Fair value measurements
Total assets at fair value					47,081,000
Recurring fair value measurement | Level 2
Fair value measurements
Total assets at fair value	0		0		0
Recurring fair value measurement | Level 2 | Money market funds
Fair value measurements
Total assets at fair value	0		0		0
Recurring fair value measurement | Level 2 | Certificates of deposit
Fair value measurements
Total assets at fair value	0		0		0
Recurring fair value measurement | Level 2 | U.S. treasury notes
Fair value measurements
Total assets at fair value					0
Recurring fair value measurement | Level 3
Fair value measurements
Total assets at fair value	0		0		0
Recurring fair value measurement | Level 3 | Money market funds
Fair value measurements
Total assets at fair value	0		0		0
Recurring fair value measurement | Level 3 | Certificates of deposit
Fair value measurements
Total assets at fair value	$ 0		$ 0		0
Recurring fair value measurement | Level 3 | U.S. treasury notes
Fair value measurements
Total assets at fair value					$ 0