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Fair Value Measurements (Details) - Measured at fair value on a recurring basis - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Cash equivalents |  |
Total Cash equivalents | $ 86,165 | $ 78,493
Short-term investments |  |
Total Short-term investments | 189,771 | 115,252
U.S. treasuries |  |
Short-term investments |  |
Total Short-term investments | 149,219 | 105,130
Government agency securities |  |
Short-term investments |  |
Total Short-term investments |  | 1,139
Corporate debt |  |
Short-term investments |  |
Total Short-term investments | 32,554 | 6,002
Commercial paper |  |
Short-term investments |  |
Total Short-term investments | 7,998 | 2,981
Certificate of deposits and time deposits |  |
Cash equivalents |  |
Total Cash equivalents | 59,168 | 67,009
Commercial paper |  |
Cash equivalents |  |
Total Cash equivalents | 2,000 | 10,484
U.S. treasuries |  |
Cash equivalents |  |
Total Cash equivalents | 24,997 |
Corporate debt |  |
Cash equivalents |  |
Total Cash equivalents |  | 1,000
Level 1 |  |
Cash equivalents |  |
Total Cash equivalents | 84,165 | 67,009
Short-term investments |  |
Total Short-term investments | 149,219 | 105,130
Level 1 | U.S. treasuries |  |
Short-term investments |  |
Total Short-term investments | 149,219 | 105,130
Level 1 | Certificate of deposits and time deposits |  |
Cash equivalents |  |
Total Cash equivalents | 59,168 | 67,009
Level 1 | U.S. treasuries |  |
Cash equivalents |  |
Total Cash equivalents | 24,997 |
Level 2 |  |
Cash equivalents |  |
Total Cash equivalents | 2,000 | 11,484
Short-term investments |  |
Total Short-term investments | 40,552 | 10,122
Level 2 | Government agency securities |  |
Short-term investments |  |
Total Short-term investments |  | 1,139
Level 2 | Corporate debt |  |
Short-term investments |  |
Total Short-term investments | 32,554 | 6,002
Level 2 | Commercial paper |  |
Short-term investments |  |
Total Short-term investments | 7,998 | 2,981
Level 2 | Commercial paper |  |
Cash equivalents |  |
Total Cash equivalents | $ 2,000 | 10,484
Level 2 | Corporate debt |  |
Cash equivalents |  |
Total Cash equivalents |  | $ 1,000

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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