Investments and Fair Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands |
Sep. 30, 2021 |
Dec. 31, 2020 |
| Marketable securities |
|
|
| Amortized Cost |
|
$ 85,118
|
| Gross Unrealized Gains |
|
6
|
| Gross Unrealized Losses |
|
(2)
|
| Investments |
$ 0
|
85,122
|
| Assets: |
|
|
| Investments |
0
|
85,122
|
| Transfers between Level 1, Level 2 or Level 3 |
|
|
| Transfer from Level 1 to Level 2, assets |
0
|
|
| U.S. treasury bills and notes |
|
|
| Marketable securities |
|
|
| Amortized Cost |
|
85,118
|
| Gross Unrealized Gains |
|
6
|
| Gross Unrealized Losses |
|
(2)
|
| Investments |
|
85,122
|
| Assets: |
|
|
| Investments |
|
85,122
|
| Recurring |
|
|
| Assets: |
|
|
| Assets |
256,034
|
173,936
|
| Recurring | U.S. money market funds |
|
|
| Assets: |
|
|
| Cash equivalents |
256,034
|
88,814
|
| Recurring | U.S. treasury bills and notes |
|
|
| Marketable securities |
|
|
| Investments |
|
85,122
|
| Assets: |
|
|
| Investments |
|
85,122
|
| Recurring | Level 1 |
|
|
| Assets: |
|
|
| Assets |
256,034
|
88,814
|
| Recurring | Level 1 | U.S. money market funds |
|
|
| Assets: |
|
|
| Cash equivalents |
$ 256,034
|
88,814
|
| Recurring | Level 2 |
|
|
| Assets: |
|
|
| Assets |
|
85,122
|
| Recurring | Level 2 | U.S. treasury bills and notes |
|
|
| Marketable securities |
|
|
| Investments |
|
85,122
|
| Assets: |
|
|
| Investments |
|
$ 85,122
|