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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | $ 69,767 | $ 57,457
Recurring |  |
Liabilities that are measured at fair value on a recurring basis |  |
Repurchase agreements | 0 | 0
Assets, fair value | 69,767 | 57,457
Recurring | Level 1 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Repurchase agreements | 0 | 0
Assets, fair value | 32,089 | 5,381
Recurring | Level 2 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Repurchase agreements | 0 | 0
Assets, fair value | 37,678 | 52,076
Recurring | Level 3 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Repurchase agreements | 0 | 0
Assets, fair value | 0 | 0
Commercial paper | Recurring |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 7,061 | 11,892
Commercial paper | Recurring | Level 1 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 0 | 0
Commercial paper | Recurring | Level 2 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 7,061 | 11,892
Commercial paper | Recurring | Level 3 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 0 | 0
Corporate Note Securities | Recurring |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 14,422 | 18,380
Corporate Note Securities | Recurring | Level 1 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 0 | 0
Corporate Note Securities | Recurring | Level 2 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 14,422 | 18,380
Corporate Note Securities | Recurring | Level 3 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 0 | 0
US Government Debt Securities | Recurring |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 7,889 | 11,295
US Government Debt Securities | Recurring | Level 1 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 0 | 0
US Government Debt Securities | Recurring | Level 2 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 7,889 | 11,295
US Government Debt Securities | Recurring | Level 3 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 0 | 0
Asset-backed Securities |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 8,306 | 10,509
Asset-backed Securities | Recurring |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 8,306 | 10,509
Asset-backed Securities | Recurring | Level 1 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 0 | 0
Asset-backed Securities | Recurring | Level 2 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 8,306 | 10,509
Asset-backed Securities | Recurring | Level 3 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Debt securities, fair value | 0 | 0
Money market funds | Recurring |  |
Liabilities that are measured at fair value on a recurring basis |  |
Money market funds | 32,089 | 5,381
Money market funds | Recurring | Level 1 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Money market funds | 32,089 | 5,381
Money market funds | Recurring | Level 2 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Money market funds | 0 | 0
Money market funds | Recurring | Level 3 |  |
Liabilities that are measured at fair value on a recurring basis |  |
Money market funds | $ 0 | $ 0

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