XML 41 R31.htm IDEA: XBRL DOCUMENT
v3.21.1

Short-term Investments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of cash equivalents and short-term investments measured at fair value | 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 |

X
- 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
Name: | us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration