Investments and Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets:
Debt securities available for sale	$ 71,624	$ 81,643
Total investment securities at fair value	107,035	116,436
Long-term investment securities at fair value	29,177	28,919
Marketable equity securities
Assets:
Total equity securities at fair value	12,973	12,724
Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	22,438	22,069
U.S. government securities
Assets:
Debt securities available for sale	788
Corporate securities
Assets:
Debt securities available for sale	30,593
U.S. government and federal agency
Assets:
Debt securities available for sale	26,235
Recurring
Assets:
Total investment securities at fair value	107,035	116,436
Long-term investment securities at fair value	29,177	28,919
Total	427,213	379,292
Recurring \| Total equity securities at fair value
Assets:
Total equity securities at fair value	35,411	34,793
Recurring \| Marketable equity securities
Assets:
Total equity securities at fair value	12,973	12,724
Recurring \| Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	22,438	22,069
Recurring \| Total debt securities available for sale
Assets:
Debt securities available for sale	71,624	81,643
Recurring \| U.S. government securities
Assets:
Debt securities available for sale	788	779
Recurring \| Corporate securities
Assets:
Debt securities available for sale	30,593	53,814
Recurring \| U.S. government and federal agency
Assets:
Debt securities available for sale	26,235	27,050
Recurring \| Index-linked U.S. bonds
Assets:
Debt securities available for sale	14,008
Recurring \| Money market funds
Assets:
Cash and cash equivalents	211,828	155,411
Recurring \| Commercial paper
Assets:
Cash and cash equivalents	55,173	54,526
Recurring \| Money market funds securing legal bonds
Assets:
Cash and cash equivalents	24,000	24,000
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total investment securities at fair value	35,411	34,793
Long-term investment securities at fair value	0	0
Total	271,239	214,204
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Total equity securities at fair value
Assets:
Total equity securities at fair value	35,411	34,793
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Marketable equity securities
Assets:
Total equity securities at fair value	12,973	12,724
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	22,438	22,069
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Total debt securities available for sale
Assets:
Debt securities available for sale	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. government securities
Assets:
Debt securities available for sale	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Corporate securities
Assets:
Debt securities available for sale	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. government and federal agency
Assets:
Debt securities available for sale	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Index-linked U.S. bonds
Assets:
Debt securities available for sale	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money market funds
Assets:
Cash and cash equivalents	211,828	155,411
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial paper
Assets:
Cash and cash equivalents	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money market funds securing legal bonds
Assets:
Cash and cash equivalents	24,000	24,000
Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Total investment securities at fair value	71,624	81,643
Long-term investment securities at fair value	0	0
Total	126,797	136,169
Recurring \| Significant Other Observable Inputs (Level 2) \| Total equity securities at fair value
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Other Observable Inputs (Level 2) \| Marketable equity securities
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Other Observable Inputs (Level 2) \| Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Other Observable Inputs (Level 2) \| Total debt securities available for sale
Assets:
Debt securities available for sale	71,624	81,643
Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. government securities
Assets:
Debt securities available for sale	788	779
Recurring \| Significant Other Observable Inputs (Level 2) \| Corporate securities
Assets:
Debt securities available for sale	30,593	53,814
Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. government and federal agency
Assets:
Debt securities available for sale	26,235	27,050
Recurring \| Significant Other Observable Inputs (Level 2) \| Index-linked U.S. bonds
Assets:
Debt securities available for sale	14,008
Recurring \| Significant Other Observable Inputs (Level 2) \| Money market funds
Assets:
Cash and cash equivalents	0	0
Recurring \| Significant Other Observable Inputs (Level 2) \| Commercial paper
Assets:
Cash and cash equivalents	55,173	54,526
Recurring \| Significant Other Observable Inputs (Level 2) \| Money market funds securing legal bonds
Assets:
Cash and cash equivalents	0	0
Recurring \| Significant Unobservable Inputs (Level 3)
Assets:
Total investment securities at fair value	0	0
Long-term investment securities at fair value	0	0
Total	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Total equity securities at fair value
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Marketable equity securities
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Mutual funds invested in debt securities
Assets:
Total equity securities at fair value	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Total debt securities available for sale
Assets:
Debt securities available for sale	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. government securities
Assets:
Debt securities available for sale	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Corporate securities
Assets:
Debt securities available for sale	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. government and federal agency
Assets:
Debt securities available for sale	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Index-linked U.S. bonds
Assets:
Debt securities available for sale	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Money market funds
Assets:
Cash and cash equivalents	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Commercial paper
Assets:
Cash and cash equivalents	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Money market funds securing legal bonds
Assets:
Cash and cash equivalents	$ 0	$ 0

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (a)
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-Publisher FASB
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- Definition

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

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-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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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Debt Securities, Trading, and Equity Securities, FV-NI, Current

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