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Cash Equivalents and Investments | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Cash Equivalents and Investments | 3. Cash Equivalents and Investments: As of September 30, 2021 and December 31, 2020, the Company's cash equivalents consisted entirely of money market funds totaling $4.4 million and $1.0 million, respectively. Investments held, all of which are classified as current assets, at September 30, 2021 and December 31, 2020 are summarized as follows (in thousands):
|  | September 30, 2021 |  |  | December 31, 2020 |
Corporate securities |  | $ | 72,532 |  |  | $ | 71,095 |
Municipal debt securities |  |  | 12,307 |  |  |  | 18,707 |
U.S. Treasury securities |  |  | 5,267 |  |  |  | 1,060 |
Certificates of deposit |  |  | 4,436 |  |  |  | 5,991 |
Federal home loan securities |  |  | 3,968 |  |  |  | 8,017 |
|  | $ | 98,510 |  |  | $ | 104,870 |

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