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Assets - Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Short-term investments |  |
Transfer of assets from Level 1 to Level 2 | $ 0 |
Transfer of assets from Level 2 to Level 1 | 0 |
Transfer of Liabilities from Level 1 to Level 2 | 0 |
Transfer of Liabilities from Level 2 to Level 1 | 0 |
Measured at fair value on a recurring basis |  |
Cash equivalents |  |
Total Cash equivalents | 97,861 | $ 69,561
Short-term investments |  |
Total Short-term investments | 95,672 | 48,189
Measured at fair value on a recurring basis | Certificate of deposits and time deposits |  |
Cash equivalents |  |
Total Cash equivalents | 59,227 | 65,571
Measured at fair value on a recurring basis | U.S. treasuries |  |
Cash equivalents |  |
Total Cash equivalents | 24,958 | 3,990
Short-term investments |  |
Total Short-term investments | 81,727 | 37,184
Measured at fair value on a recurring basis | Corporate debt |  |
Cash equivalents |  |
Total Cash equivalents | 3,001 |
Short-term investments |  |
Total Short-term investments | 5,006 | 8,516
Measured at fair value on a recurring basis | Commercial paper |  |
Cash equivalents |  |
Total Cash equivalents | 10,675 |
Short-term investments |  |
Total Short-term investments | 8,939 | 2,489
Measured at fair value on a recurring basis | Level 1 |  |
Cash equivalents |  |
Total Cash equivalents | 84,185 | 69,561
Short-term investments |  |
Total Short-term investments | 81,727 | 37,184
Measured at fair value on a recurring basis | Level 1 | Certificate of deposits and time deposits |  |
Cash equivalents |  |
Total Cash equivalents | 59,227 | 65,571
Measured at fair value on a recurring basis | Level 1 | U.S. treasuries |  |
Cash equivalents |  |
Total Cash equivalents | 24,958 | 3,990
Short-term investments |  |
Total Short-term investments | 81,727 | 37,184
Measured at fair value on a recurring basis | Level 2 |  |
Cash equivalents |  |
Total Cash equivalents | 13,676 |
Short-term investments |  |
Total Short-term investments | 13,945 | 11,005
Measured at fair value on a recurring basis | Level 2 | Corporate debt |  |
Cash equivalents |  |
Total Cash equivalents | 3,001 |
Short-term investments |  |
Total Short-term investments | 5,006 | 8,516
Measured at fair value on a recurring basis | Level 2 | Commercial paper |  |
Cash equivalents |  |
Total Cash equivalents | 10,675 |
Short-term investments |  |
Total Short-term investments | $ 8,939 | $ 2,489

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