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Fair Value Measurement - Summary of Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | $ 94,570 | $ 24,389
Available for sale securities, contractual maturities between 1 to 5 years | 133,235 | 196,990
Available for sale securities, contractual maturities between 5 to 10 years | 53,600 | 55,605
Available for sale securities, contractual maturities after 10 years | 13,988 |
Available for sale securities, contractual maturities, Total | 295,393 | 276,984
Corporate Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 7,238 | 14,183
Available for sale securities, contractual maturities between 1 to 5 years | 120,887 | 144,894
Available for sale securities, contractual maturities between 5 to 10 years | 25,936 | 22,735
Available for sale securities, contractual maturities, Total | 154,061 | 181,812
U.S. Treasuries [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 20,632 | 4,919
Available for sale securities, contractual maturities between 1 to 5 years | 804 | 40,240
Available for sale securities, contractual maturities, Total | 21,436 | 45,159
U.S. Government Agency Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 2,128 | 4,788
Available for sale securities, contractual maturities between 1 to 5 years | 6,425 | 7,031
Available for sale securities, contractual maturities between 5 to 10 years | 27,664 | 32,870
Available for sale securities, contractual maturities, Total | 36,217 | 44,689
Supranational Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities between 1 to 5 years | 4,800 | 4,741
Available for sale securities, contractual maturities, Total | 4,800 | 4,741
Money Market Funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 64,572 | 449
Available for sale securities, contractual maturities, Total | 64,572 | 449
Asset Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities between 1 to 5 years | 319 | 84
Available for sale securities, contractual maturities after 10 years | 13,988 |
Available for sale securities, contractual maturities, Total | $ 14,307 | 84
Municipal Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year |  | 50
Available for sale securities, contractual maturities, Total |  | $ 50

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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 latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + 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=118939692&loc=d3e27161-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + 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 in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 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=118939692&loc=d3e27161-111563 + Details
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