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Cash Equivalents and Marketable Securities - Classification of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Classified as:
Cash equivalents	$ 116,068	$ 113,693
Marketable securities - current	193,759	188,451
Marketable securities - noncurrent	38,169	2,000
Total cash equivalents and marketable securities	$ 347,996	$ 304,144
Contractual maturities
Maximum period of current contractual maturities	1 year	1 year
Minimum period of noncurrent contractual maturities	1 year	1 year
Maximum period of Noncurrent contractual maturities	2 years	2 years

X

- Definition

The aggregate fair value of amount of investment in debt and equity securities and cash equivalents categorized neither as held-to-maturity nor trading.

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- Definition

Represents the maximum period of current contractual maturities.

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Represents the maximum period of contractual maturities.

+ References

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- Definition

Represents the minimum period of noncurrent contractual maturities.

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- Definition

Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
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Amount of investment in marketable security, classified as current.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Amount of investment in marketable security, classified as noncurrent.

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