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Cash, Cash Equivalents and Short-Term Investments (Tables) | 6 Months Ended
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Jun. 30, 2020
Cash And Cash Equivalents [Abstract] |
Schedule of Cash and Cash Equivalents and Short-Term Investments by Significant Investment Category | The following tables show the Company’s cash and cash equivalents and short-term investments by significant investment category as of June 30, 2020, and December 31, 2019 (in thousands):
|  | June 30, 2020 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Estimated fair value |  |  | Cash and cash equivalents |  |  | Short term investments |
Cash |  | $ | 3,747 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,747 |  |  | $ | 3,747 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 24,846 |  |  |  | — |  |  |  | — |  |  |  | 24,846 |  |  |  | 24,846 |  |  |  | — |
U.S. treasury securities |  |  | 2,067 |  |  |  | 5 |  |  |  | — |  |  |  | 2,072 |  |  |  | — |  |  |  | 2,072 |
Subtotal |  |  | 26,913 |  |  |  | 5 |  |  |  | — |  |  |  | 26,918 |  |  |  | 24,846 |  |  |  | 2,072 |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Corporate debt obligations |  |  | 2,182 |  |  |  | 7 |  |  |  | — |  |  |  | 2,189 |  |  |  | — |  |  |  | 2,189 |
Repurchase agreements |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Asset-backed securities |  |  | 2,254 |  |  |  | 5 |  |  |  | — |  |  |  | 2,259 |  |  |  | — |  |  |  | 2,259 |
Subtotal |  |  | 4,436 |  |  |  | 12 |  |  |  | — |  |  |  | 4,448 |  |  |  | — |  |  |  | 4,448 |
Total |  | $ | 35,096 |  |  | $ | 17 |  |  | $ | - |  |  | $ | 35,113 |  |  | $ | 28,593 |  |  | $ | 6,520 |
|  | December 31, 2019 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Estimated fair value |  |  | Cash and cash equivalents |  |  | Short term investments |
Cash |  | $ | 3,950 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,950 |  |  | $ | 3,950 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 5,500 |  |  |  | — |  |  |  | — |  |  |  | 5,500 |  |  |  | 5,500 |  |  |  | — |
U.S. treasury securities |  |  | 3,078 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 3,079 |  |  |  | — |  |  |  | 3,079 |
Subtotal |  |  | 8,578 |  |  |  | 2 |  |  |  | (1 | ) |  |  | 8,579 |  |  |  | 5,500 |  |  |  | 3,079 |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 8,920 |  |  |  | — |  |  |  | — |  |  |  | 8,920 |  |  |  | 747 |  |  |  | 8,173 |
Corporate debt obligations |  |  | 5,922 |  |  |  | 5 |  |  |  | (1 | ) |  |  | 5,926 |  |  |  | — |  |  |  | 5,926 |
Repurchase agreements |  |  | 3,000 |  |  |  | — |  |  |  | — |  |  |  | 3,000 |  |  |  | 3,000 |  |  |  | — |
Asset-backed securities |  |  | 4,505 |  |  |  | 3 |  |  |  | — |  |  |  | 4,508 |  |  |  | — |  |  |  | 4,508 |
Subtotal |  |  | 22,347 |  |  |  | 8 |  |  |  | (1 | ) |  |  | 22,354 |  |  |  | 3,747 |  |  |  | 18,607 |
Total |  | $ | 34,875 |  |  | $ | 10 |  |  | $ | (2 | ) |  | $ | 34,883 |  |  | $ | 13,197 |  |  | $ | 21,686 |

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