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Fair Value Measurement - Summary of Contractual Maturities of Available for Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | $ 24,389 | $ 73,537
Available for sale securities, contractual maturities between 1 to 5 years | 196,990 | 171,655
Available for sale securities, contractual maturities between 5 to 10 years | 55,605 | 52,693
Available for sale securities, contractual maturities after 10 years |  | 6,577
Available for sale securities, contractual maturities, Total | 276,984 | 304,462
Corporate Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 14,183 | 5,426
Available for sale securities, contractual maturities between 1 to 5 years | 144,894 | 153,567
Available for sale securities, contractual maturities between 5 to 10 years | 22,735 | 19,102
Available for sale securities, contractual maturities after 10 years |  | 6,577
Available for sale securities, contractual maturities, Total | 181,812 | 184,672
U.S. Treasuries [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 4,919 | 32,466
Available for sale securities, contractual maturities between 1 to 5 years | 40,240 | 13,723
Available for sale securities, contractual maturities, Total | 45,159 | 46,189
U.S. Government Agency Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 4,788 | 65
Available for sale securities, contractual maturities between 1 to 5 years | 7,031 | 4,355
Available for sale securities, contractual maturities between 5 to 10 years | 32,870 | 33,591
Available for sale securities, contractual maturities, Total | 44,689 | 38,011
Commercial Paper [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year |  | 18,973
Available for sale securities, contractual maturities, Total |  | 18,973
Supranational [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities between 1 to 5 years | 4,741 |
Available for sale securities, contractual maturities, Total | 4,741 |
Money Market Funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 449 | 16,139
Available for sale securities, contractual maturities, Total | 449 | 16,139
Asset Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities between 1 to 5 years | 84 | 10
Available for sale securities, contractual maturities, Total | 84 | 10
Municipal Bonds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale securities, contractual maturities less than 1 year | 50 | 468
Available for sale securities, contractual maturities, Total | $ 50 | $ 468

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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=82897076&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=82897076&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=82897076&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=82897076&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 after 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 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 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=82897076&loc=d3e27161-111563 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 (d) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + Details
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