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Assets - Fair Value (Details) - USD ($) $ in Thousands | Jun. 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 | 106,976 | $ 69,561
Short-term investments |  |
Total Short-term investments | 84,495 | 48,189
Measured at fair value on a recurring basis | Certificate of deposits and time deposits |  |
Cash equivalents |  |
Total Cash equivalents | 59,151 | 65,571
Measured at fair value on a recurring basis | U.S. treasuries |  |
Cash equivalents |  |
Total Cash equivalents | 29,914 | 3,990
Short-term investments |  |
Total Short-term investments | 56,905 | 37,184
Measured at fair value on a recurring basis | Government agency securities |  |
Short-term investments |  |
Total Short-term investments | 4,995 |
Measured at fair value on a recurring basis | Corporate debt |  |
Short-term investments |  |
Total Short-term investments | 1,001 | 8,516
Measured at fair value on a recurring basis | Commercial paper |  |
Cash equivalents |  |
Total Cash equivalents | 17,911 |
Short-term investments |  |
Total Short-term investments | 21,594 | 2,489
Measured at fair value on a recurring basis | Level 1 |  |
Cash equivalents |  |
Total Cash equivalents | 89,065 | 69,561
Short-term investments |  |
Total Short-term investments | 56,905 | 37,184
Measured at fair value on a recurring basis | Level 1 | Certificate of deposits and time deposits |  |
Cash equivalents |  |
Total Cash equivalents | 59,151 | 65,571
Measured at fair value on a recurring basis | Level 1 | U.S. treasuries |  |
Cash equivalents |  |
Total Cash equivalents | 29,914 | 3,990
Short-term investments |  |
Total Short-term investments | 56,905 | 37,184
Measured at fair value on a recurring basis | Level 2 |  |
Cash equivalents |  |
Total Cash equivalents | 17,911 |
Short-term investments |  |
Total Short-term investments | 27,590 | 11,005
Measured at fair value on a recurring basis | Level 2 | Government agency securities |  |
Short-term investments |  |
Total Short-term investments | 4,995 |
Measured at fair value on a recurring basis | Level 2 | Corporate debt |  |
Short-term investments |  |
Total Short-term investments | 1,001 | 8,516
Measured at fair value on a recurring basis | Level 2 | Commercial paper |  |
Cash equivalents |  |
Total Cash equivalents | 17,911 |
Short-term investments |  |
Total Short-term investments | $ 21,594 | $ 2,489

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