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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Held-to-Maturity Securities | The Company's investment in marketable securities as of December 31, 2019 and 2020 are classified as ''held-to-maturity'' and consist of the following:
|  | Amortized cost basis** |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding (losses) |  |  | Aggregate fair value* |
|  | US$ thousands |
At December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and government debt securities |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 35,445 |  |  |  | 265 |  |  |  | (102 | ) |  |  | 35,608 |
Non-Current |  |  | 15,365 |  |  |  | 339 |  |  |  | - |  |  |  | 15,704 |
|  |  | 50,810 |  |  |  | 604 |  |  |  | (102 | ) |  |  | 51,312 |
At December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and government debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 14,170 |  |  |  | 24 |  |  |  | (97 | ) |  |  | 14,097 |
Non-Current |  |  | 46,955 |  |  |  | 408 |  |  |  | (112 | ) |  |  | 47,251 |
|  |  | 61,125 |  |  |  | 432 |  |  |  | (209 | ) |  |  | 61,348 |
* | Fair value is being determined using quoted market prices in active markets (Level 2).
** | Including accrued interest in the amount of US$ 538 thousand and US$ 412 thousand as of December 31, 2019 and 2020, 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 2020 |  | 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 December 31, 2020 |  |  | 50,810 |
Summary of Investment Securities in an Unrealized Loss Position | The following table summarizes the gross unrealized losses on investment securities for which other-than-temporary impairments have not been recognized and the fair value of those securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2020:
|  | 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 |  |  | (2 | ) |  |  | 1,105 |  |  |  | (100 | ) |  |  | 6,770 |  |  |  | (102 | ) |  |  | 7,875 |

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