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Fair Value Measurements - Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
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 |  | $ 0
Total short-term investments | 43,262 | $ 28,369 |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Short term investments | 43,300 | 28,400 |
Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Short term investments |  | 22,909 |
Total short-term investments | 39,327 |  |
Recurring | Level 1 | Available-for-sale equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities | 39,327 | 22,909 |
Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Short term investments |  | 5,460 |
Total short-term investments | 3,935 |  |
Recurring | Level 2 | Available-for-sale equity securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Available-for-sale securities | 3,926 | 5,450 |
Recurring | Level 2 | Mortgage-CMO debt securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Short term investments | $ 9 | $ 10 |

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