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Fair Value Measurements - Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Amount of transfers of financial assets between Level 1 and Level 2 measures | $ 0 |
Total short-term investments | 40,590 | $ 34,036
Level 1 | Available-for-sale securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total short-term investments | 40,600 | 34,000
Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total short-term investments | 39,556 | 33,250
Recurring | Level 1 | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total short-term investments | 39,556 | 33,250
Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total short-term investments | 1,034 | 786
Recurring | Level 2 | Equity securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total short-term investments | 1,026 | 778
Recurring | Level 2 | Mortgage-CMO debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total short-term investments | $ 8 | $ 8

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