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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Held-to-Maturity Securities |
|  | Amortized cost basis** |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding (losses) |  |  | Aggregate fair value* |
|  | US$ thousands |
At December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and government debt securities |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 8,300 |  |  |  | 43 |  |  |  | (19 | ) |  |  | 8,324 |
Non-Current (1 to 4 years) |  |  | 23,966 |  |  |  | 10 |  |  |  | (512 | ) |  |  | 23,464 |
|  |  | 32,266 |  |  |  | 53 |  |  |  | (531 | ) |  |  | 31,788 |
At December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and government debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 35,445 |  |  |  | 265 |  |  |  | (102 | ) |  |  | 35,608 |
Non-Current (1 to 5 years) |  |  | 15,365 |  |  |  | 339 |  |  |  | - |  |  |  | 15,704 |
|  |  | 50,810 |  |  |  | 604 |  |  |  | (102 | ) |  |  | 51,312 |
* | Fair value is being determined using Level 2 inputs.
** | Including accrued interest in the amount of US$ 412 thousand and US$ 227 thousand as of December 31, 2020 and 2021, respectively.
| The accrued interest is presented as part of other receivables on the balance sheet.
Schedule of Reconciliation of Marketable Securities |
Activity in marketable securities in 2021 |  | US$ thousands |
Balance at January 1, 2020 |  |  | 61,125 |
Purchases of marketable securities |  |  | 6,558 |
Discount on marketable securities, net |  |  | (244 | )
Proceeds from maturity of marketable securities |  |  | (16,629 | )
Balance at January 1, 2021 |  |  | 50,810 |
Purchases of marketable securities |  |  | 19,927 |
Discount on marketable securities, net |  |  | (621 | )
Proceeds from maturity of marketable securities |  |  | (37,850 | )
Balance at December 31, 2021 |  |  | 32,266 |
Summary of Investment Securities in an Unrealized Loss Position |
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
Held to maturity: |  | Unrealized Losses |  |  | Fair value |  |  | Unrealized Losses |  |  | Fair value |  |  | Unrealized Losses |  |  | Fair value |
Corporate debt securities and government debt securities |  |  | (531 | ) |  |  | 25,814 |  |  |  | — |  |  |  | — |  |  |  | (531 | ) |  |  | 25,814 |
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
Held to maturity: |  | Unrealized Gains |  |  | Fair value |  |  | Unrealized Gains |  |  | Fair value |  |  | Unrealized Gains |  |  | Fair value |
Corporate debt securities and government debt securities |  |  | — |  |  |  | — |  |  |  | 53 |  |  |  | 5,974 |  |  |  | 53 |  |  |  | 5,974 |

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