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Cash, Cash Equivalents and Short-Term Investments (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2020, and December 31, 2019 (in thousands):
|  | March 31, 2020 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Estimated fair value |  |  | Cash and cash equivalents |  |  | Short term investments |
Cash |  | $ | 2,048 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,048 |  |  | $ | 2,048 |  |  | $ | — |
Level 1(1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  |  | 20,485 |  |  |  | — |  |  |  | — |  |  |  | 20,485 |  |  |  | 20,485 |  |  |  | — |
U.S. treasury securities |  |  | 2,058 |  |  |  | 14 |  |  |  | — |  |  |  | 2,072 |  |  |  | — |  |  |  | 2,072 |
Subtotal |  |  | 22,543 |  |  |  | 14 |  |  |  | — |  |  |  | 22,557 |  |  |  | 20,485 |  |  |  | 2,072 |
Level 2(2): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 1,498 |  |  |  | — |  |  |  | — |  |  |  | 1,498 |  |  |  | — |  |  |  | 1,498 |
Corporate debt obligations |  |  | 4,456 |  |  |  | — |  |  |  | (8 | ) |  |  | 4,448 |  |  |  | — |  |  |  | 4,448 |
Repurchase agreements |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Asset-backed securities |  |  | 3,011 |  |  |  | — |  |  |  | (13 | ) |  |  | 2,998 |  |  |  | — |  |  |  | 2,998 |
Subtotal |  |  | 8,965 |  |  |  | — |  |  |  | (21 | ) |  |  | 8,944 |  |  |  | — |  |  |  | 8,944 |
Total |  | $ | 33,556 |  |  | $ | 14 |  |  | $ | (21 | ) |  | $ | 33,549 |  |  | $ | 22,533 |  |  | $ | 11,016 |
|  | 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(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(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 |
| (1) | Level 1 fair value estimates are based on quoted prices in active markets for identical assets or liabilities.
| (2) | Level 2 fair value estimates are based on observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Schedule of Short-Term Investments | The following table presents the Company's short-term investments with unrealized losses by investment category and length of time that individual securities have been in a continuous unrealized loss position as of March 31, 2020 (in thousands):
|  | Less than 12 months |
Description of securities |  | Amortized cost |  |  | Unrealized losses |
Corporate debt obligations |  | $ | 3,699 |  |  | $ | (8 | )
Asset-backed securities |  |  | 3,011 |  |  |  | (13 | )
Total |  | $ | 6,710 |  |  | $ | (21 | )

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