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Marketable Securities - Schedule of Marketable Securities by Category (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 189,309 | $ 62,681
Gross Unrealized Holding Gains | 260 | 43
Gross Unrealized Holding Losses | 6 | 40
Fair Value | 189,563 | 62,684
Municipal notes and bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 80,926 | 62,681
Gross Unrealized Holding Gains | 188 | 43
Gross Unrealized Holding Losses | 6 | 40
Fair Value | 81,108 | $ 62,684
Asset-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,767 |
Gross Unrealized Holding Gains | 12 |
Gross Unrealized Holding Losses | 0 |
Fair Value | 10,779 |
Certificates of deposits [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 30,500 |
Gross Unrealized Holding Gains | 7 |
Gross Unrealized Holding Losses | 0 |
Fair Value | 30,507 |
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 30,707 |
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 0 |
Fair Value | 30,708 |
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 36,409 |
Gross Unrealized Holding Gains | 52 |
Gross Unrealized Holding Losses | 0 |
Fair Value | $ 36,461 |

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