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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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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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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

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