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Short-term and long-term invesmtents (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments | The Company’s short-term and long-term investments, consisting of debt instruments classified as held-to-maturity and equity investments with readily determinable fair values or redemption values, were as follows:
| December 31, 2020 |  | December 31, 2019
| Debt securities |  | Equity securities |  | Total |  | Debt securities |  | Equity securities |  | Total
Certificates of deposit and other time deposits | $ | 8,217 |  |  | $ | — |  |  | $ | 8,217 |  |  | $ | 8,140 |  |  | $ | — |  |  | $ | 8,140 |
Investments in mutual funds and common stock | — |  |  | 44,077 |  |  | 44,077 |  |  | — |  |  | 39,951 |  |  | 39,951 |
| $ | 8,217 |  |  | $ | 44,077 |  |  | $ | 52,294 |  |  | $ | 8,140 |  |  | $ | 39,951 |  |  | $ | 48,091 |
Short-term investments | $ | 8,217 |  |  | $ | 11,884 |  |  | $ | 20,101 |  |  | $ | 8,140 |  |  | $ | 3,432 |  |  | $ | 11,572 |
Long-term investments | — |  |  | 32,193 |  |  | 32,193 |  |  | — |  |  | 36,519 |  |  | 36,519 |
| $ | 8,217 |  |  | $ | 44,077 |  |  | $ | 52,294 |  |  | $ | 8,140 |  |  | $ | 39,951 |  |  | $ | 48,091 |

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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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