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Short-term Investments | 3 Months Ended
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Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Short-term Investments | Short-term Investments Our investments consist of highly-rated instruments that mature in less than 12 months. We classify our short-term investments as available for sale. Available-for-sale securities are recorded on our condensed consolidated balance sheets at fair market value and any unrealized gains or losses are reported as part of other comprehensive loss on our condensed consolidated statements of comprehensive loss. We determine realized gains or losses on the sales of investments through the specific identification method and record such gains or losses as part of interest and other expense, net on our condensed consolidated statements of operations. We did not have any material realized gains or losses on investments during the three months ended March 31, 2021 and 2020. We measure the fair value of investments on a recurring basis. Accrued interest receivables related to our available-for-sale securities of $0.6 million and $0.5 million as of March 31, 2021 and December 31, 2020 were included within prepaid expenses and other assets on our condensed consolidated balance sheets. The following table summarizes, by major security type, our cash equivalents and short-term investments that are measured at fair value on a recurring basis (in thousands) as of March 31, 2021:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash equivalents |  | Short-term Investments
| (unaudited)
Money market funds | $ | 125,378 |  |  | $ | — |  |  | $ | — |  |  | $ | 125,378 |  |  | $ | 125,378 |  |  | $ | — |
U.S. Treasury notes | 49,123 |  |  | 7 |  |  | — |  |  | 49,130 |  |  | — |  |  | 49,130 |
Commercial paper | 57,067 |  |  | — |  |  | — |  |  | 57,067 |  |  | — |  |  | 57,067 |
Corporate bonds | 27,615 |  |  | — |  |  | (5) |  |  | 27,610 |  |  | — |  |  | 27,610 |
Total | $ | 259,183 |  |  | $ | 7 |  |  | $ | (5) |  |  | $ | 259,185 |  |  | $ | 125,378 |  |  | $ | 133,807 |
The following table summarizes, by major security type, our cash equivalents and short-term investments that are measured at fair value on a recurring basis (in thousands) as of December 31, 2020:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash equivalents |  | Short-term Investments
Money market funds | $ | 79,387 |  |  | $ | — |  |  | $ | — |  |  | $ | 79,387 |  |  | $ | 79,387 |  |  | $ | — |
US treasury notes | 59,382 |  |  | 7 |  |  | — |  |  | 59,389 |  |  | — |  |  | 59,389 |
Commercial paper | 68,018 |  |  | — |  |  | — |  |  | 68,018 |  |  | — |  |  | 68,018 |
Corporate bonds | 48,494 |  |  | 8 |  |  | (1) |  |  | 48,501 |  |  | — |  |  | 48,501 |
Asset-backed securities | 3,009 |  |  | — |  |  | — |  |  | 3,009 |  |  | — |  |  | 3,009 |
Total | $ | 258,290 |  |  | $ | 15 |  |  | $ | (1) |  |  | $ | 258,304 |  |  | $ | 79,387 |  |  | $ | 178,917 |
On a quarterly basis we evaluate unrealized losses on our available-for-sale debt securities and the related accrued interest receivables to determine whether a decline in the fair value below the amortized cost basis is due to credit-related factors or noncredit-related factors. We do not intend to sell investments that are in an unrealized loss position and it is not likely that we will be required to sell any investments before recovery of their amortized cost basis. As of March 31, 2021 and December 31, 2020, there were no material unrealized losses due to credit-related factors.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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