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Investments in debt and equity securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments | The Company’s short-term and long-term debt and equity investments, consisting of debt instruments classified as held-to-maturity and equity investments with readily determinable fair values or redemption values, were as follows:
| September 30, 2021 |  | December 31, 2020
| Debt securities |  | Equity securities |  | Total |  | Debt securities |  | Equity securities |  | Total
Certificates of deposit and other time deposits | $ | 8,225 |  |  | $ | — |  |  | $ | 8,225 |  |  | $ | 8,217 |  |  | $ | — |  |  | $ | 8,217 |
Investments in mutual funds and common stocks | — |  |  | 52,063 |  |  | 52,063 |  |  | — |  |  | 44,077 |  |  | 44,077 |
| $ | 8,225 |  |  | $ | 52,063 |  |  | $ | 60,288 |  |  | $ | 8,217 |  |  | $ | 44,077 |  |  | $ | 52,294 |
Short-term investments | $ | 8,225 |  |  | $ | 18,465 |  |  | $ | 26,690 |  |  | $ | 8,217 |  |  | $ | 11,884 |  |  | $ | 20,101 |
Long-term investments | — |  |  | 33,598 |  |  | 33,598 |  |  | — |  |  | 32,193 |  |  | 32,193 |
| $ | 8,225 |  |  | $ | 52,063 |  |  | $ | 60,288 |  |  | $ | 8,217 |  |  | $ | 44,077 |  |  | $ | 52,294 |

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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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