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Cash Equivalents and Investments (Tables) | 6 Months Ended
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Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments |
|  | June 30, 2019 |  |  | December 31, 2018 |
|  | Short-Term |  |  | Long-Term |  |  | Short-Term |  |  | Long-Term |
Municipal debt securities |  | $ | 43,272 |  |  | $ | — |  |  | $ | 18,473 |  |  | $ | 30,841 |
Federal home loan securities |  |  | 34,397 |  |  |  | — |  |  |  | 2,000 |  |  |  | 34,393 |
Certificates of deposit |  |  | 5,166 |  |  |  | — |  |  |  | 1,450 |  |  |  | 4,465 |
|  | $ | 82,835 |  |  | $ | — |  |  | $ | 21,923 |  |  | $ | 69,699 |

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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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