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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Marketable securities:
Fair value, Marketable securities	$ 640,085	$ 251,756
Municipal bonds [Member]
Marketable securities:
Fair value, Marketable securities	3,044
Fair Value, Measurements, Recurring [Member]
Cash equivalents and Marketable securities:
Assets, Fair Value	738,940	264,165
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]
Marketable securities:
Fair value, Marketable securities	3,044
Fair Value, Measurements, Recurring [Member] | Corporate Notes and Bonds [Member]
Marketable securities:
Fair value, Marketable securities	125,604	155,740
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]
Cash equivalents:
Fair value, Cash equivalents	4,999
Marketable securities:
Fair value, Marketable securities	10,995	63,506
Fair Value, Measurements, Recurring [Member] | U.S. Agency Obligations [Member]
Marketable securities:
Fair value, Marketable securities	54,007	32,510
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member]
Cash equivalents:
Fair value, Cash equivalents	69,999
Marketable securities:
Fair value, Marketable securities	446,435
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]
Cash equivalents:
Fair value, Cash equivalents	23,857	12,409
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Cash equivalents and Marketable securities:
Assets, Fair Value	23,857	12,409
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal bonds [Member]
Marketable securities:
Fair value, Marketable securities	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate Notes and Bonds [Member]
Marketable securities:
Fair value, Marketable securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commercial Paper [Member]
Cash equivalents:
Fair value, Cash equivalents	0
Marketable securities:
Fair value, Marketable securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Agency Obligations [Member]
Marketable securities:
Fair value, Marketable securities	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury Securities [Member]
Cash equivalents:
Fair value, Cash equivalents	0
Marketable securities:
Fair value, Marketable securities	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money Market Funds [Member]
Cash equivalents:
Fair value, Cash equivalents	23,857	12,409
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Cash equivalents and Marketable securities:
Assets, Fair Value	715,083	251,756
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal bonds [Member]
Marketable securities:
Fair value, Marketable securities	3,044
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Notes and Bonds [Member]
Marketable securities:
Fair value, Marketable securities	125,604	155,740
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial Paper [Member]
Cash equivalents:
Fair value, Cash equivalents	4,999
Marketable securities:
Fair value, Marketable securities	10,995	63,506
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Agency Obligations [Member]
Marketable securities:
Fair value, Marketable securities	54,007	32,510
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury Securities [Member]
Cash equivalents:
Fair value, Cash equivalents	69,999
Marketable securities:
Fair value, Marketable securities	446,435
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Money Market Funds [Member]
Cash equivalents:
Fair value, Cash equivalents	$ 0	$ 0

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Cash Equivalents and Marketable Securities [Abstract]

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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