Investments - Amortized Cost of Unrealized Gains and Losses and Fair Value of Investments (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 69,317,000	$ 99,943,000
Unrealized Gain	0	0
Unrealized Loss	(479,000)	(109,000)
Fair Value	$ 68,838,000	$ 99,834,000
Weighted-average maturity of short-term investments	4 months 24 days	4 months 24 days
Debt securities, available-for-sale, credit loss	$ 0		$ 0
Fair value of available-for-sale investments in a continuous unrealized loss position for 12 months or longer	$ 18,500,000	$ 0
Short-term investments: | Minimum
Debt Securities, Available-for-sale [Line Items]
Range of maturities	1 month	1 month
Short-term investments: | Maximum
Debt Securities, Available-for-sale [Line Items]
Range of maturities	12 months	12 months
Long-term investments:
Debt Securities, Available-for-sale [Line Items]
Weighted-average maturity of short-term investments		1 year 2 months 12 days
Corporate debt securities and commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 43,318,000	$ 75,896,000
Unrealized Gain	0	0
Unrealized Loss	(156,000)	(26,000)
Fair Value	43,162,000	75,870,000
U.S. treasury securities and government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	25,999,000
Unrealized Gain	0
Unrealized Loss	(323,000)
Fair Value	$ 25,676,000
US Government Obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		16,024,000
Unrealized Gain		0
Unrealized Loss		(60,000)
Fair Value		15,964,000
Corporate debt securities and commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		8,023,000
Unrealized Gain		0
Unrealized Loss		(23,000)
Fair Value		$ 8,000,000