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Cash, Cash Equivalents and Investments (Tables) | 6 Months Ended
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Jun. 30, 2021
Cash and Cash Equivalents [Abstract] |
Schedule of Securities Classified as Cash, Cash Equivalents and Investments | Securities classified as cash, cash equivalents and investments as of June 30, 2021 and December 31, 2020 are summarized below (in thousands):
| June 30, 2021
|  |  | Gross Unrealized |  |
| Amortized Cost |  | Gains |  | Losses |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 845 |  |  | $ | — |  |  | $ | — |  |  | $ | 845 |
Money market funds | 84,650 |  |  | — |  |  | — |  |  | 84,650 |
Commercial paper | 1,250 |  |  | — |  |  | — |  |  | 1,250 |
Total cash and cash equivalents | 86,745 |  |  | — |  |  | — |  |  | 86,745 |
Short-term investments |  |  |  |  |  |  |
Commercial paper | $ | 62,719 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 62,725 |
Corporate bonds | 16,964 |  |  | 1 |  |  | (1) |  |  | 16,964 |
Asset-backed securities | 5,376 |  |  | — |  |  | (1) |  |  | 5,375 |
Total short-term investments | 85,059 |  |  | 7 |  |  | (2) |  |  | 85,064 |
Total cash equivalents and investments | $ | 171,804 |  |  | $ | 7 |  |  | $ | (2) |  |  | $ | 171,809 |
| December 31, 2020
|  |  | Gross Unrealized |  |
| Amortized Cost |  | Gains |  | Losses |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 781 |  |  | $ | — |  |  | $ | — |  |  | $ | 781 |
Money market funds | 88,151 |  |  | — |  |  | — |  |  | 88,151 |
Commercial paper | 2,100 |  |  | — |  |  | — |  |  | 2,100 |
Total cash and cash equivalents | 91,032 |  |  | — |  |  | — |  |  | 91,032 |
Short-term investments |  |  |  |  |  |  |
Commercial paper | $ | 60,631 |  |  | $ | 2 |  |  | $ | (4) |  |  | $ | 60,629 |
Corporate bonds | 24,547 |  |  | 3 |  |  | (6) |  |  | 24,544 |
U.S. government-sponsored agency bonds | 9,277 |  |  | 2 |  |  | — |  |  | 9,279 |
U.S. treasury notes | 1,000 |  |  | — |  |  | — |  |  | 1,000 |
Total short-term investments | 95,455 |  |  | 7 |  |  | (10) |  |  | 95,452 |
Long-term investments: |  |  |  |  |  |  |
Corporate bonds | $ | 2,115 |  |  |  |  | $ | (1) |  |  | 2,114 |
Total cash equivalents and investments | $ | 188,602 |  |  | $ | 7 |  |  | $ | (11) |  |  | $ | 188,598 |

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