XML 34 R23.htm IDEA: XBRL DOCUMENT
v3.21.2

Investments (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
Investments Debt And Equity Securities [Abstract] |
Schedule of Available-for-sale Investments | Available-for-sale investments consisted of the following as of September 30, 2021 and December 31, 2020 (in thousands):
|  | September 30, 2021 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Estimated Fair Value |
Short-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 277,331 |  |  | $ | 87 |  |  | $ | — |  |  | $ | 277,418 |
Corporate bonds |  |  | 15,225 |  |  |  | 1 |  |  |  | (5 | ) |  |  | 15,221 |
Total short-term marketable securities |  | $ | 292,556 |  |  | $ | 88 |  |  | $ | (5 | ) |  | $ | 292,639 |
Long-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 204,694 |  |  | $ | 6 |  |  | $ | (74 | ) |  | $ | 204,626 |
Corporate bonds |  |  | 12,761 |  |  |  | — |  |  |  | (8 | ) |  |  | 12,753 |
Total long-term marketable securities |  | $ | 217,455 |  |  | $ | 6 |  |  | $ | (82 | ) |  | $ | 217,379 |
|  | December 31, 2020 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Estimated Fair Value |
Short-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 552,539 |  |  | $ | 723 |  |  | $ | (10 | ) |  | $ | 553,252 |
Corporate bonds |  |  | 11,497 |  |  |  | 86 |  |  |  | (2 | ) |  |  | 11,581 |
Total short-term marketable securities |  | $ | 564,036 |  |  | $ | 809 |  |  | $ | (12 | ) |  | $ | 564,833 |
Long-term marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government debt securities |  | $ | 118,429 |  |  | $ | 98 |  |  | $ | (2 | ) |  | $ | 118,525 |
Total long-term marketable securities |  | $ | 118,429 |  |  | $ | 98 |  |  | $ | (2 | ) |  | $ | 118,525 |
Schedule of Gross Unrealized Holding Losses and Fair Value for Investments in Unrealized Loss Position | The following table presents the gross unrealized holding losses and fair value for investments in an unrealized loss position, and the length of time individual securities have been in a continuous loss position, as of September 30, 2021 (in thousands):
|  | Less Than 12 Months |  |  | 12 Months Or Greater |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
U.S. government debt securities |  | $ | 163,664 |  |  | $ | (74 | ) |  | $ | — |  |  | $ | — |
Corporate bonds |  |  | 22,888 |  |  |  | (13 | ) |  |  | — |  |  |  | — |
Total available-for-sale securities |  | $ | 186,552 |  |  | $ | (87 | ) |  | $ | — |  |  | $ | — |

X
- 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=123581744&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=124269663&loc=SL82922888-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types: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

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration