Investments (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Marketable Securities [Line Items]
Amortized Cost	$ 77,983,000		$ 89,411,000
Gains	5,000		0
Losses	(636,000)		(978,000)
Credit Losses	0		0
Estimated Fair Value	$ 77,352,000		$ 88,433,000
Remaining contractual maturity period	3 years		3 years
Impairments of assets	$ 0	$ 0
Short-term investments
Marketable Securities [Line Items]
Estimated Fair Value	57,442,000		$ 68,471,000
Long-term investments
Marketable Securities [Line Items]
Estimated Fair Value	19,910,000		19,962,000
Commercial paper
Marketable Securities [Line Items]
Amortized Cost	14,306,000		15,707,000
Gains	0		0
Losses	(48,000)		(101,000)
Credit Losses	0		0
Estimated Fair Value	14,258,000		15,606,000
Corporate notes
Marketable Securities [Line Items]
Amortized Cost	43,157,000		52,159,000
Gains	0		0
Losses	(559,000)		(831,000)
Credit Losses	0		0
Estimated Fair Value	42,598,000		51,328,000
U.S. government securities
Marketable Securities [Line Items]
Amortized Cost	4,920,000
Gains	5,000
Losses	0
Credit Losses	0
Estimated Fair Value	4,925,000
U.S. government agency bonds
Marketable Securities [Line Items]
Amortized Cost	15,600,000		21,545,000
Gains	0		0
Losses	(29,000)		(46,000)
Credit Losses	0		0
Estimated Fair Value	$ 15,571,000		$ 21,499,000