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Financial Instruments | 12 Months Ended
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Dec. 31, 2021
Investments All Other Investments [Abstract] |
Financial Instruments |
5. | Financial Instruments
Cash equivalents and investments (debt securities) which are classified as available-for-sale securities, consisted of the following (in thousands):
December 31, 2021 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Money market funds (cash equivalents) |  | $ | 44,347 |  |  | $ | — |  |  | $ | — |  |  | $ | 44,347 |
U.S. government agency securities |  |  | 2,504 |  |  |  | — |  |  |  | — |  |  |  | 2,504 |
Total financial assets |  | $ | 46,851 |  |  | $ | — |  |  | $ | — |  |  | $ | 46,851 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 44,347 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,504 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 46,851 |
December 31, 2020 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Money market funds (cash equivalents) |  | $ | 30,360 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,360 |
U.S. government agency securities |  |  | 37,835 |  |  |  | 2 |  |  |  | — |  |  |  | 37,837 |
Federal agency securities |  |  | 13,697 |  |  |  | 3 |  |  |  | — |  |  |  | 13,700 |
Total financial assets |  | $ | 81,892 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 81,897 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 30,360 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,994 |
Long-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,543 |
|  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 81,897 |
There have been no material realized gains or losses on available-for-sale debt securities for the periods presented. As of December 31, 2021, the remaining contractual maturities of $2.5 million of available-for-sale debt securities were less than one year.

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- Definition The entire disclosure for financial instruments. This disclosure includes, but is not limited to, fair value measurements of short and long term marketable securities, international currencies forward contracts, and auction rate securities. Financial instruments may include hedging and non-hedging currency exchange instruments, derivatives, securitizations and securities available for sale at fair value. Also included are investment results, realized and unrealized gains and losses as well as impairments and risk management disclosures. + References No definition available. + Details
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- References No definition available. + Details
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