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Fair Value Measurement - Summary of Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | $ 34,004 | $ 138,534
Available for sale securities, contractual maturities between 1 to 5 years | 74,009 | 81,754
Available for sale securities, contractual maturities between 5 to 10 years | 186,252 | 56,462
Available for sale securities, contractual maturities after 10 years | 31,321 | 36,793
Available for sale securities, contractual maturities, Total | 325,586 | 313,543
Corporate Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 22,114 | 49,308
Available for sale securities, contractual maturities between 1 to 5 years | 48,127 | 61,315
Available for sale securities, contractual maturities between 5 to 10 years | 100,345 | 34,172
Available for sale securities, contractual maturities, Total | 170,586 | 144,795
Money Market Funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 10,885 | 82,066
Available for sale securities, contractual maturities, Total | 10,885 | 82,066
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
Available for sale securities, contractual maturities between 1 to 5 years | 23,742 | 18,668
Available for sale securities, contractual maturities between 5 to 10 years | 18,823 | 20,670
Available for sale securities, contractual maturities, Total | 42,565 | 40,351
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 | 153 | 267
Available for sale securities, contractual maturities between 5 to 10 years | 2,200 |
Available for sale securities, contractual maturities after 10 years | 31,321 | 36,793
Available for sale securities, contractual maturities, Total | 33,674 | 37,062
U.S. Treasuries [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 1,005 | 1,367
Available for sale securities, contractual maturities between 1 to 5 years | 1,987 | 1,504
Available for sale securities, contractual maturities between 5 to 10 years | 64,884 | 1,620
Available for sale securities, contractual maturities, Total | $ 67,876 | 4,491
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, Total |  | $ 4,778

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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=123581744&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=123599081&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=123581744&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=123581744&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=123581744&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=123599081&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=123599081&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=123581744&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=123581744&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=123599081&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=123581744&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=123581744&loc=d3e27161-111563 + Details
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