Investments and Fair Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands |
3 Months Ended |
|
Mar. 31, 2021 |
Dec. 31, 2020 |
| Marketable securities |
|
|
| Amortized Cost |
$ 42,557
|
$ 85,118
|
| Gross Unrealized Gains |
7
|
6
|
| Gross Unrealized Losses |
|
(2)
|
| Investments |
42,564
|
85,122
|
| Assets: |
|
|
| Investments |
42,564
|
85,122
|
| Transfers between Level 1, Level 2 or Level 3 |
|
|
| Transfers between Level 1, Level 2 and Level 3 |
0
|
|
| U.S. treasury bills and notes |
|
|
| Marketable securities |
|
|
| Amortized Cost |
42,557
|
85,118
|
| Gross Unrealized Gains |
7
|
6
|
| Gross Unrealized Losses |
|
(2)
|
| Investments |
42,564
|
85,122
|
| Assets: |
|
|
| Investments |
42,564
|
85,122
|
| Recurring |
|
|
| Assets: |
|
|
| Assets |
317,911
|
173,936
|
| Recurring | Money market funds |
|
|
| Assets: |
|
|
| Cash equivalents |
275,347
|
88,814
|
| Recurring | U.S. treasury bills and notes |
|
|
| Marketable securities |
|
|
| Investments |
42,564
|
85,122
|
| Assets: |
|
|
| Investments |
42,564
|
85,122
|
| Recurring | Level 1 |
|
|
| Assets: |
|
|
| Assets |
275,347
|
88,814
|
| Recurring | Level 1 | Money market funds |
|
|
| Assets: |
|
|
| Cash equivalents |
275,347
|
88,814
|
| Recurring | Level 2 |
|
|
| Assets: |
|
|
| Assets |
42,564
|
85,122
|
| Recurring | Level 2 | U.S. treasury bills and notes |
|
|
| Marketable securities |
|
|
| Investments |
42,564
|
85,122
|
| Assets: |
|
|
| Investments |
$ 42,564
|
$ 85,122
|