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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2019
Marketable Securities [Abstract] |
Schedule of Marketable Securities by Category | At December 31, 2019 and 2018, marketable securities are categorized as follows:
|  | Amortized Cost |  |  | Gross Unrealized Holding Gains |  |  | Gross Unrealized Holding Losses |  |  | Fair Value |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal notes and bonds |  | $ | 80,926 |  |  | $ | 188 |  |  | $ | 6 |  |  | $ | 81,108 |
Asset-backed securities |  |  | 10,767 |  |  |  | 12 |  |  |  | — |  |  |  | 10,779 |
Certificates of deposit |  |  | 30,500 |  |  |  | 7 |  |  |  | — |  |  |  | 30,507 |
Commercial paper |  |  | 30,707 |  |  |  | 1 |  |  |  | — |  |  |  | 30,708 |
Corporate bonds |  |  | 36,409 |  |  |  | 52 |  |  |  | — |  |  |  | 36,461 |
Total marketable securities |  | $ | 189,309 |  |  | $ | 260 |  |  | $ | 6 |  |  | $ | 189,563 |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal notes and bonds |  | $ | 62,681 |  |  | $ | 43 |  |  | $ | 40 |  |  | $ | 62,684 |
Total marketable securities |  | $ | 62,681 |  |  | $ | 43 |  |  | $ | 40 |  |  | $ | 62,684 |
Schedule of Amortized Cost and Estimated Fair Value of Marketable Securities Classified by Maturity Date | The amortized cost and estimated fair value of marketable securities classified by the maturity date listed on the security, regardless of the Consolidated Balance Sheet classification, is as follows at December 31, 2019 and 2018:
|  | December 31, 2019 |  |  | December 31, 2018 |
|  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Due within one year |  | $ | 152,649 |  |  | $ | 152,852 |  |  | $ | 47,767 |  |  | $ | 47,732 |
Due after one through five years |  |  | 36,660 |  |  |  | 36,711 |  |  |  | 14,914 |  |  |  | 14,952 |
Due after five through ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Due after ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total marketable securities |  | $ | 189,309 |  |  | $ | 189,563 |  |  | $ | 62,681 |  |  | $ | 62,684 |
Summary of Estimated Fair Value and Gross Unrealized Holding Losses of Marketable Securities in Unrealized Loss Position | The following table summarizes the estimated fair value and gross unrealized holding losses of marketable securities, aggregated by investment instrument and period of time in an unrealized loss position, at December 31, 2019 and 2018.
|  | In Unrealized Loss Position For Less Than 12 Months |  |  | In Unrealized Loss Position For Greater Than 12 Months |
|  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal notes and bonds |  | $ | 14,166 |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |
Total marketable securities |  | $ | 14,166 |  |  | $ | 6 |  |  | $ | — |  |  | $ | — |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal notes and bonds |  | $ | 27,952 |  |  | $ | 30 |  |  | $ | 4,671 |  |  | $ | 10 |
Total marketable securities |  | $ | 27,952 |  |  | $ | 30 |  |  | $ | 4,671 |  |  | $ | 10 |

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- Definition Tabular disclosure of 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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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