Investments (Details) - USD ($)	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 133,549,000		$ 32,349,000
Unrealized losses	(396,000)		(17,000)
Fair value	133,153,000		32,332,000
Investment, available-for-sale, current	128,269,000		32,332,000
Available-for-sale securities, credit losses recognized	0	$ 0
Available-for-sale securities, allowance for credit loss	0		0
Realized gains (loses)	0	$ 0
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	30,154,000		32,349,000
Unrealized losses	(139,000)		(17,000)
Fair value	30,015,000		32,332,000
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized cost	81,037,000		0
Unrealized losses	(226,000)		0
Fair value	80,811,000		0
U.S. treasury bills
Debt Securities, Available-for-sale [Line Items]
Amortized cost	22,358,000		0
Unrealized losses	(31,000)		0
Fair value	22,327,000		$ 0
Investment, available for sale, noncurrent	$ 4,900,000

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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