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Fair Value Measurements (Details) - Measured at fair value on a recurring basis - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Cash equivalents |  |
Total Cash equivalents | $ 69,561 | $ 76,739
Short-term investments |  |
Total Short-term investments | 48,189 | 47,780
Certificate of deposits and time deposits |  |
Cash equivalents |  |
Total Cash equivalents | 65,571 | 64,249
U.S. treasuries |  |
Cash equivalents |  |
Total Cash equivalents | 3,990 | 12,490
Short-term investments |  |
Total Short-term investments | 37,184 | 33,895
Corporate debt |  |
Short-term investments |  |
Total Short-term investments | 8,516 | 10,886
Commercial paper |  |
Short-term investments |  |
Total Short-term investments | 2,489 | 2,999
Level 1 |  |
Cash equivalents |  |
Total Cash equivalents | 69,561 | 76,739
Short-term investments |  |
Total Short-term investments | 37,184 | 33,895
Level 1 | Certificate of deposits and time deposits |  |
Cash equivalents |  |
Total Cash equivalents | 65,571 | 64,249
Level 1 | U.S. treasuries |  |
Cash equivalents |  |
Total Cash equivalents | 3,990 | 12,490
Short-term investments |  |
Total Short-term investments | 37,184 | 33,895
Level 2 |  |
Short-term investments |  |
Total Short-term investments | 11,005 | 13,885
Level 2 | Corporate debt |  |
Short-term investments |  |
Total Short-term investments | 8,516 | 10,886
Level 2 | Commercial paper |  |
Short-term investments |  |
Total Short-term investments | $ 2,489 | $ 2,999

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