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Assets - Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
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 | 83,999 | $ 86,165
Short-term investments |  |
Total Short-term investments | 186,142 | 189,771
Measured at fair value on a recurring basis | U.S. treasuries |  |
Short-term investments |  |
Total Short-term investments | 120,096 | 149,219
Measured at fair value on a recurring basis | Corporate debt |  |
Short-term investments |  |
Total Short-term investments | 58,449 | 32,554
Measured at fair value on a recurring basis | Commercial paper |  |
Short-term investments |  |
Total Short-term investments | 7,597 | 7,998
Measured at fair value on a recurring basis | Certificate of deposits and time deposits |  |
Cash equivalents |  |
Total Cash equivalents | 80,062 | 59,168
Measured at fair value on a recurring basis | Corporate debt |  |
Cash equivalents |  |
Total Cash equivalents | 2,002 |
Measured at fair value on a recurring basis | Commercial paper |  |
Cash equivalents |  |
Total Cash equivalents | 950 | 2,000
Measured at fair value on a recurring basis | Money market cash |  |
Cash equivalents |  |
Total Cash equivalents | 985 |
Measured at fair value on a recurring basis | U.S. treasuries |  |
Cash equivalents |  |
Total Cash equivalents |  | 24,997
Measured at fair value on a recurring basis | Level 1 |  |
Cash equivalents |  |
Total Cash equivalents | 81,047 | 84,165
Short-term investments |  |
Total Short-term investments | 120,096 | 149,219
Measured at fair value on a recurring basis | Level 1 | U.S. treasuries |  |
Short-term investments |  |
Total Short-term investments | 120,096 | 149,219
Measured at fair value on a recurring basis | Level 1 | Certificate of deposits and time deposits |  |
Cash equivalents |  |
Total Cash equivalents | 80,062 | 59,168
Measured at fair value on a recurring basis | Level 1 | Money market cash |  |
Cash equivalents |  |
Total Cash equivalents | 985 |
Measured at fair value on a recurring basis | Level 1 | U.S. treasuries |  |
Cash equivalents |  |
Total Cash equivalents |  | 24,997
Measured at fair value on a recurring basis | Level 2 |  |
Cash equivalents |  |
Total Cash equivalents | 2,952 | 2,000
Short-term investments |  |
Total Short-term investments | 66,046 | 40,552
Measured at fair value on a recurring basis | Level 2 | Corporate debt |  |
Short-term investments |  |
Total Short-term investments | 58,449 | 32,554
Measured at fair value on a recurring basis | Level 2 | Commercial paper |  |
Short-term investments |  |
Total Short-term investments | 7,597 | 7,998
Measured at fair value on a recurring basis | Level 2 | Corporate debt |  |
Cash equivalents |  |
Total Cash equivalents | 2,002 |
Measured at fair value on a recurring basis | Level 2 | Commercial paper |  |
Cash equivalents |  |
Total Cash equivalents | $ 950 | $ 2,000

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