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Investments in marketable securities (Tables) | 6 Months Ended
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Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Marketable securities | Investments in marketable securities consisted of the following:
| Amortized Cost |  | Gross Unrealized Gain(1) |  | Gross Unrealized Loss(1) |  | Fair Value
As of June 30, 2023 | (in thousands)
Cash equivalents |  |  |  |  |  |  |
Money market | $ | 21,816 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,816 |
Total | $ | 21,816 |  |  | $ | — |  |  | $ | — |  |  | $ | 21,816 |
Investments in marketable short-term securities |  |  |  |  |  |  |
US government agency bonds | $ | 35,624 |  |  | $ | — |  |  | $ | (314) |  |  | $ | 35,310 |
US corporate bonds | 56,066 |  |  | — |  |  | (507) |  |  | 55,559 |
US treasury bills | 7,834 |  |  | — |  |  | (4) |  |  | 7,830 |
US government bonds | 26,944 |  |  | — |  |  | (356) |  |  | 26,588 |
Total | $ | 126,468 |  |  | $ | — |  |  | $ | (1,181) |  |  | $ | 125,287 |
Investments in marketable long-term securities |  |  |  |  |  |  |
US corporate bonds | 9,161 |  |  | — |  |  | (66) |  |  | 9,095 |
Yankee bonds | 1,999 |  |  | — |  |  | (37) |  |  | 1,962 |
Total | $ | 11,160 |  |  | $ | — |  |  | $ | (103) |  |  | $ | 11,057 |
(1) Gross unrealized gain (loss) is pre-tax and is reported in accumulated other comprehensive loss.
| Amortized Cost |  | Gross Unrealized Gain(1) |  | Gross Unrealized Loss(1) |  | Fair Value
As of December 31, 2022 | (in thousands)
Cash equivalents |  |  |  |  |  |  |
Money market | $ | 23,218 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,218 |
Total | $ | 23,218 |  |  | $ | — |  |  | $ | — |  |  | $ | 23,218 |
Investments in marketable short-term securities |  |  |  |  |  |  |
US government agency bonds | $ | 26,686 |  |  | $ | — |  |  | $ | (424) |  |  | $ | 26,262 |
US corporate bonds | 27,144 |  |  | — |  |  | (303) |  |  | 26,841 |
US treasury bills | 8,483 |  |  | — |  |  | (16) |  |  | 8,467 |
US government bonds | $ | 55,361 |  |  | $ | — |  |  | $ | (794) |  |  | $ | 54,567 |
Total | $ | 117,674 |  |  | $ | — |  |  | $ | (1,537) |  |  | $ | 116,137 |
Investments in marketable long-term securities |  |  |  |  |  |  |
US government agency bonds | $ | 3,724 |  |  | $ | — |  |  | $ | (130) |  |  | $ | 3,594 |
US treasury bills | 25,433 |  |  | — |  |  | (336) |  |  | 25,097 |
US government bonds | 8,972 |  |  | — |  |  | (300) |  |  | 8,672 |
Total | $ | 38,129 |  |  | $ | — |  |  | $ | (766) |  |  | $ | 37,363 |
(1) Gross unrealized gain (loss) is pre-tax and is reported in accumulated other comprehensive loss.

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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