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Fair Value Measurement - Summary of Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | $ 138,534 | $ 94,570
Available for sale securities, contractual maturities between 1 to 5 years | 81,754 | 133,235
Available for sale securities, contractual maturities between 5 to 10 years | 56,462 | 53,600
Available for sale securities, contractual maturities after 10 years | 36,793 | 13,988
Available for sale securities, contractual maturities, Total | 313,543 | 295,393
Corporate Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 49,308 | 7,238
Available for sale securities, contractual maturities between 1 to 5 years | 61,315 | 120,887
Available for sale securities, contractual maturities between 5 to 10 years | 34,172 | 25,936
Available for sale securities, contractual maturities, Total | 144,795 | 154,061
U.S. Treasuries [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 1,367 | 20,632
Available for sale securities, contractual maturities between 1 to 5 years | 1,504 | 804
Available for sale securities, contractual maturities between 5 to 10 years | 1,620 |
Available for sale securities, contractual maturities, Total | 4,491 | 21,436
U.S. Government Agency Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 1,013 | 2,128
Available for sale securities, contractual maturities between 1 to 5 years | 18,668 | 6,425
Available for sale securities, contractual maturities between 5 to 10 years | 20,670 | 27,664
Available for sale securities, contractual maturities, Total | 40,351 | 36,217
Supranational Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 4,778 |
Available for sale securities, contractual maturities between 1 to 5 years |  | 4,800
Available for sale securities, contractual maturities, Total | 4,778 | 4,800
Money Market Funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 82,066 | 64,572
Available for sale securities, contractual maturities, Total | 82,066 | 64,572
Asset Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 2 |
Available for sale securities, contractual maturities between 1 to 5 years | 267 | 319
Available for sale securities, contractual maturities after 10 years | 36,793 | 13,988
Available for sale securities, contractual maturities, Total | $ 37,062 | $ 14,307

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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