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Investments and Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financial Assets
Total	$ 198,033	$ 228,216
Commercial paper
Financial Assets
Marketable investments	4,249	4,246
U.S. agency and government sponsored securities
Financial Assets
Marketable investments	4,555	7,857
U.S. states and municipalities
Financial Assets
Marketable investments	47,425	48,095
Corporate bonds
Financial Assets
Marketable investments	130,748	134,964
Money market funds
Financial Assets
Cash equivalents	11,056	33,054
Level 1
Financial Assets
Total	11,056	33,054
Level 1 | Commercial paper
Financial Assets
Marketable investments	0	0
Level 1 | U.S. agency and government sponsored securities
Financial Assets
Marketable investments	0	0
Level 1 | U.S. states and municipalities
Financial Assets
Marketable investments	0	0
Level 1 | Corporate bonds
Financial Assets
Marketable investments	0	0
Level 1 | Money market funds
Financial Assets
Cash equivalents	11,056	33,054
Level 2
Financial Assets
Total	186,977	195,162
Level 2 | Commercial paper
Financial Assets
Marketable investments	4,249	4,246
Level 2 | U.S. agency and government sponsored securities
Financial Assets
Marketable investments	4,555	7,857
Level 2 | U.S. states and municipalities
Financial Assets
Marketable investments	47,425	48,095
Level 2 | Corporate bonds
Financial Assets
Marketable investments	130,748	134,964
Level 2 | Money market funds
Financial Assets
Cash equivalents	0	0
Level 3
Financial Assets
Total	0	0
Level 3 | Commercial paper
Financial Assets
Marketable investments	0	0
Level 3 | U.S. agency and government sponsored securities
Financial Assets
Marketable investments	0	0
Level 3 | U.S. states and municipalities
Financial Assets
Marketable investments	0	0
Level 3 | Corporate bonds
Financial Assets
Marketable investments	0	0
Level 3 | Money market funds
Financial Assets
Cash equivalents	$ 0	$ 0

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

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+ References

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- Definition

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.

+ References

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