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Marketable Securities and Fair Value Measurements - Securities in Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 20,355 | $ 2,996
12 Months or More | 0 | 0
Total | 20,355 | 2,996
Gross Unrealized Losses |  |
Less Than 12 Months | (8) | (1)
12 Months or More | 0 | 0
Total | (8) | (1)
Certificates of deposit |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or More | 0 | 0
Total | 0 | 0
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | 0 | 0
Total | 0 | 0
Corporate securities |  |
Fair Value |  |
Less Than 12 Months | 20,355 | 2,996
12 Months or More | 0 | 0
Total | 20,355 | 2,996
Gross Unrealized Losses |  |
Less Than 12 Months | (8) | (1)
12 Months or More | 0 | 0
Total | (8) | (1)
U.S. Treasury and agency securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or More | 0 | 0
Total | 0 | 0
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | 0 | 0
Total | 0 | 0
Commercial paper |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or More | 0 | 0
Total | 0 | 0
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | 0 | 0
Total | 0 | 0
Asset-backed securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or More | 0 | 0
Total | 0 | 0
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | 0 | 0
Total | $ 0 | $ 0

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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