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Cash Equivalents and Investments (Tables) | 12 Months Ended
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Dec. 31, 2020
Cash Equivalents And Investments [Abstract] |
Schedule of Fair Value Cash Equivalents and Available-for-sale Investments | The fair value of cash equivalents and available-for-sale investments at December 31, 2020 and 2019, were as follows (in thousands):
| December 31, 2020
| Amortized Cost |  | Gross Unrealized |  | Estimated Fair Value
|  | Gains |  | Losses |
Money market funds | $ | 59,823 |  |  | $ | — |  |  | $ | — |  |  | $ | 59,823 |
U.S. government securities | 190,663 |  |  | 16 |  |  | (2) |  |  | 190,677 |
Corporate notes | 26,426 |  |  | 2 |  |  | (5) |  |  | 26,423 |
Commercial paper | 29,489 |  |  | — |  |  | — |  |  | 29,489 |
Total available-for-sale marketable debt securities | $ | 306,401 |  |  | $ | 18 |  |  | $ | (7) |  |  | $ | 306,412 |
Classified as: |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  | $ | 59,823 |
Short-term investments |  |  |  |  |  |  | 246,589 |
Long-term investments |  |  |  |  |  |  | — |
Total cash equivalents and available-for-sale investments |  |  |  |  |  |  | $ | 306,412 |
| December 31, 2019
| Amortized Cost |  | Gross Unrealized |  | Estimated Fair Value
|  | Gains |  | Losses |
Money market funds | $ | 13,897 |  |  | $ | — |  |  | $ | — |  |  | $ | 13,897 |
U.S. government securities | 77,329 |  |  | 72 |  |  | (1) |  |  | 77,400 |
Corporate notes | 14,955 |  |  | 11 |  |  | — |  |  | 14,966 |
Commercial paper | 35,753 |  |  | — |  |  | — |  |  | 35,753 |
Total available-for-sale marketable debt securities | $ | 141,934 |  |  | $ | 83 |  |  | $ | (1) |  |  | $ | 142,016 |
Classified as: |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  | $ | 13,897 |
Short-term investments |  |  |  |  |  |  | 120,089 |
Long-term investments |  |  |  |  |  |  | 8,030 |
Total cash equivalents and available-for-sale investments |  |  |  |  |  |  | $ | 142,016 |
Schedule of Fair Value Cash Equivalents, Short-term, and Long-term Marketable Securities Classified by Maturity | The following table summarizes the fair value of the Company's cash equivalents, short-term and long-term marketable securities classified by maturity (in thousands):
| December 31,
| 2020 |  | 2019
Due within one year | $ | 306,412 |  |  | $ | 133,986 |
Due after one year through three years | — |  |  | 8,030 |
Total cash equivalents and available-for-sale investments | $ | 306,412 |  |  | $ | 142,016 |
Schedule of Available-for-Sale Securities in an Unrealized Loss Position | The following tables present the Company's available-for-sale securities that were in an unrealized loss position as of December 31, 2020 (in thousands):
| December 31, 2020
| Less than 12 months |  | 12 Months or Greater |  | Total
Assets | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss
U.S. government securities | $ | 28,487 |  |  | $ | (2) |  |  | $ | — |  |  | $ | — |  |  | $ | 28,487 |  |  | $ | (2) |
Corporate notes | 13,883 |  |  | (5) |  |  | — |  |  | — |  |  | 13,883 |  |  | (5) |
Total | $ | 42,370 |  |  | $ | (7) |  |  | $ | — |  |  | $ | — |  |  | $ | 42,370 |  |  | $ | (7) |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: 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=121590138&loc=SL82922954-210456 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922888-210455 + Details
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