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Investments | 9 Months Ended
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Sep. 30, 2021
Investments [Abstract] |
Investments | 2. Investments Investments consists of available-for-sale securities as follows (in thousands):
|  | September 30, 2021 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Estimated Fair Value |
Short-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Corporate bonds |  |  | 83,208 |  |  |  | — |  |  |  | (9 | ) |  |  | 83,199 |
Total short-term marketable securities |  | $ | 83,208 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 83,199 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 3,995 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,995 |
Corporate bonds |  |  | 19,633 |  |  |  | — |  |  |  | (9 | ) |  |  | 19,624 |
Total long-term marketable securities |  | $ | 23,628 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 23,619 |
All the commercial paper, U.S. government debt securities, and corporate bonds designated as short-term marketable securities have a contractual maturity date that is equal to or less than one year from the respective balance sheet date. Those that are designated as long-term marketable securities have a contractual maturity date that is more than one year from the respective balance sheet date. Accrued interest receivable is excluded from the amortized cost and estimated fair value of the Company's marketable securities. Accrued interest receivable of $0.3 million is presented separately within the prepaid expenses and other current assets line items in the Company's unaudited condensed consolidated balance sheet as of September 30, 2021. As of September 30, 2021, there were $45.9 million of corporate bonds in a continual unrealized loss position for less than 12 months. There were no investments in a continual unrealized loss position for greater than twelve months. As of September 30, 2021, the Company did not intend, nor was the Company more likely than not to be required, to sell its available-for-sale investments before the recovery of the amortized cost basis, which may be maturity. Based on the Company's assessment, it concluded that none of the available-for-sale investments held as of September 30, 2021 were considered to be impaired, as such, no impairment loss was recorded for the three and nine months ended September 30, 2021.

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- Definition The entire disclosure for investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -URI http://asc.fasb.org/topic&trid=75115024 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -URI http://asc.fasb.org/topic&trid=2197064 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI http://asc.fasb.org/topic&trid=2196965 + Details
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- References No definition available. + Details
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