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Financial Instruments | 9 Months Ended
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Sep. 30, 2021
Investments All Other Investments [Abstract] |
Financial Instruments |
4. | Financial Instruments
Cash equivalents and investments (debt securities) which are classified as available-for-sale securities, consisted of the following (in thousands):
September 30, 2021 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Money market funds (cash equivalents) |  | $ | 59,157 |  |  | $ | — |  |  | $ | — |  |  | $ | 59,157 |
U.S. government agency securities |  |  | 2,513 |  |  |  | 1 |  |  |  | — |  |  |  | 2,514 |
Federal agency securities |  |  | 2,857 |  |  |  | — |  |  |  | — |  |  |  | 2,857 |
Total financial assets |  | $ | 64,527 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 64,528 |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 59,157 |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,371 |
Total financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 64,528 |
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 |
Total financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 81,897 |
There have been no material realized gains or losses on available-for-sale debt securities for the periods presented. As of September 30, 2021, the remaining contractual maturities of $5.4 million of available-for-sale debt securities were less than one year. The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable, and other accrued liabilities approximate their fair values due to the short-term maturity of these instruments.

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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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