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Investments - Debt Securities and Other Investments, Recorded at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 37,528 | $ 41,042
Gross Unrealized Gains | 153 | 27
Gross Unrealized Losses | (21) | (270)
Fair Value | 37,660 | 40,799
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 9,304 | 20,777
Gross Unrealized Gains | 80 | 19
Gross Unrealized Losses |  | (112)
Fair Value | 9,384 | 20,684
Municipal Fixed-Rate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 930 | 1,339
Gross Unrealized Losses |  | (26)
Fair Value | 930 | 1,313
Asset-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,867 | 5,230
Gross Unrealized Gains | 26 | 5
Gross Unrealized Losses | (3) | (14)
Fair Value | 6,890 | 5,221
Mortgage/Agency-Backed Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,944 | 3,833
Gross Unrealized Gains | 26 | 2
Gross Unrealized Losses | (8) | (44)
Fair Value | 6,962 | 3,791
U.S. Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 12,311 | 9,271
Gross Unrealized Gains | 21 | 1
Gross Unrealized Losses | (9) | (66)
Fair Value | 12,323 | 9,206
Variable Rate Demand Notes [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 800 |
Fair Value | 800 |
Foreign Government Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 372 | 592
Gross Unrealized Losses | (1) | (8)
Fair Value | $ 371 | $ 584

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + 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 (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + 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 (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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