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Cash and Investments - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) investment	Dec. 31, 2020 USD ($) investment	Dec. 31, 2019 USD ($)
Available-for-Sale Debt Securities
Short-term available-for-sale securities contractual maturities, maximum	1 year
Long-term securities contractual maturities, minimum	1 year
Other-than-temporary impairment | $	$ 0	$ 0	$ 0
Investment in continuous unrealized loss position for more than one year | investment	0	0

X

- Definition

Available-For-Sale Securities, Debt Securities, Current, Contractual Maturities, Maximum

+ References

No definition available.

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- Definition

Available-For-Sale Securities, Debt Securities, Noncurrent, Contractual Maturities, Minimum

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- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455

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- Definition

Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562

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