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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash - Components (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Cash, Money Market Funds, and Marketable Securities |  |  |
Cash and cash equivalents | $ 123,231 | $ 142,837 | $ 96,349
Fair Value, Cash balances | 123,231 | 142,837 |
Cost, available-for-sale securities | 215,613 | 309,665 |
Gross unrealized gain, available-for-sale securities | 190 | 255 |
Gross unrealized loss, available-for-sale securities | (161) | (17) |
Fair value, Available-for-sale debt securities | 215,642 | 309,903 |
Cost, Cash balances and available-for-sale securities | 338,844 | 452,502 |
Gross unrealized gain, Cash balances and available-for-sale securities | 190 | 255 |
Gross unrealized loss, Cash balances and available-for-sale securities | (161) | (17) |
Fair value, Cash balances and available-for-sale securities | 338,873 | 452,740 |
Marketable securities with maturity date greater than 12 months |  | 9,500 |
Corporate debt securities |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Corporate debt securities, Cost | 107,152 | 145,875 |
Corporate debt securities, Gross Unrealized Gain | 65 | 121 |
Corporate debt securities, Gross Unrealized Loss | (119) | (5) |
Corporate debt securities, Fair Value | 107,098 | 145,991 |
Commercial paper |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Cost, available-for-sale securities | 35,248 | 73,659 |
Gross unrealized gain, available-for-sale securities | 100 | 53 |
Gross unrealized loss, available-for-sale securities | 0 | (2) |
Fair value, Available-for-sale debt securities | 35,348 | 73,710 |
Asset-backed securities |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Corporate debt securities, Cost | 68,812 | 77,731 |
Corporate debt securities, Gross Unrealized Gain | 25 | 79 |
Corporate debt securities, Gross Unrealized Loss | (42) | 0 |
Corporate debt securities, Fair Value | 68,795 | 77,810 |
U.S. government agency bonds |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Corporate debt securities, Cost | 4,000 | 11,999 |
Corporate debt securities, Gross Unrealized Gain | 0 | 2 |
Corporate debt securities, Gross Unrealized Loss | 0 | (10) |
Corporate debt securities, Fair Value | 4,000 | 11,991 |
Money market |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Cost, available-for-sale securities | 350 | 350 |
Gross unrealized gain, available-for-sale securities | 0 | 0 |
Gross unrealized loss, available-for-sale securities | 0 | 0 |
Fair value, Available-for-sale debt securities | 350 | 350 |
Certificates of deposit |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Cost, available-for-sale securities | 51 | 51 |
Gross unrealized gain, available-for-sale securities | 0 | 0 |
Gross unrealized loss, available-for-sale securities | 0 | 0 |
Fair value, Available-for-sale debt securities | $ 51 | $ 51 |

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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Also includes amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents cash and cash equivalents and marketable securities. + References No definition available. + Details
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