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Cash Equivalents and Marketable Securities - Classification of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Classified as:
Cash equivalents	$ 113,693	$ 31,707
Marketable securities - current	188,451	100,011
Marketable securities - noncurrent	2,000
Total cash equivalents and marketable securities	$ 304,144	131,718
Contractual maturities
Maximum period of current contractual maturities	1 year
Minimum period of noncurrent contractual maturities	1 year
Maximum period of Noncurrent contractual maturities	2 years
Realized Gain (loss)	$ 0	$ 0

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.

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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
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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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-Topic 210
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Amount of investment in marketable security, classified as noncurrent.

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Amount of realized gain (loss) on investment in marketable security, excluding other-than-temporary impairment (OTTI).

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