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Cash, Cash Equivalents and Short-Term Investments - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short-term investments in continuous unrealized loss position for 12 months or less, Estimated fair value | $ 3,399 | $ 10,977
Short-term investments in continuous unrealized loss position for 12 months or less, Unrealized losses | (2) | (10)
US Treasury Securities |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short-term investments in continuous unrealized loss position for 12 months or less, Estimated fair value | 1,218 | 1,988
Short-term investments in continuous unrealized loss position for 12 months or less, Unrealized losses | (1) |
Corporate Debt Securities |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short-term investments in continuous unrealized loss position for 12 months or less, Estimated fair value | 1,428 | 5,957
Short-term investments in continuous unrealized loss position for 12 months or less, Unrealized losses | (1) | (7)
Asset-backed Securities |  |
Cash And Cash Equivalents And Short Term Investments [Line Items] |  |
Short-term investments in continuous unrealized loss position for 12 months or less, Estimated fair value | $ 753 | 3,032
Short-term investments in continuous unrealized loss position for 12 months or less, Unrealized losses |  | $ (3)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 + Details
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