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Cash, Cash Equivalents and Investments - Components of Cash, Cash Equivalents and Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cash | $ 185,624 | $ 266,609
Money market instruments | 537 | 2,464
Cash and cash equivalents | 186,161 | 269,073
Current investments, amortized cost of $137,124 and $102,258 in 2021 and 2020, respectively, allowance for credit losses of $0 in 2021 and 2020 | 137,455 | 103,240
Non-current investments | 583,748 | 395,125
Total | 907,364 | 767,438
Treasury Bills [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $137,124 and $102,258 in 2021 and 2020, respectively, allowance for credit losses of $0 in 2021 and 2020 | 18,912 | 35,403
Long-term investments | 39,753 | 96,458
Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $137,124 and $102,258 in 2021 and 2020, respectively, allowance for credit losses of $0 in 2021 and 2020 | 37,655 | 25,160
Long-term investments | 43,940 | 67,058
Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $137,124 and $102,258 in 2021 and 2020, respectively, allowance for credit losses of $0 in 2021 and 2020 | 73,088 | 32,714
Long-term investments | 481,218 | 203,428
Sovereign Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $137,124 and $102,258 in 2021 and 2020, respectively, allowance for credit losses of $0 in 2021 and 2020 | 0 | 8,660
Long-term investments | 2,119 | 3,440
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $137,124 and $102,258 in 2021 and 2020, respectively, allowance for credit losses of $0 in 2021 and 2020 | 4,998 | 1,303
Long-term investments | 641 | 5,735
Agency Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Current investments, amortized cost of $137,124 and $102,258 in 2021 and 2020, respectively, allowance for credit losses of $0 in 2021 and 2020 | 2,802 | 0
Long-term investments | $ 16,077 | $ 19,006

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- Definition Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840 + Details
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