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Fair Value of Financial Instruments Including Cash, Cash Equivalents and Investments - Schedule of Cash, Cash Equivalents, and Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Fair Value Disclosures [Abstract] |  |
Cash and cash equivalents due in 90 days or less, Amortized Cost | $ 29,514 | $ 34,887
Certificates of deposit due in one year or less, Amortized Cost | 134,808 | 122,800
Total cash, cash equivalents, and investments, Amortized Cost | 164,322 | 157,687
Cash and cash equivalents due in 90 days or less, Estimated Fair Value | 29,514 | 34,887
Certificates of deposit due in one year or less, Estimated Fair Value | 134,808 | 122,800
Total cash, cash equivalents, and investments, Estimated Fair Value | $ 164,322 | $ 157,687

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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