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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Held-to-Maturity Securities |
The Company's investment in marketable securities as of December 31, 2017 and 2018 are classified as ''held-to-maturity'' and consist of the following:
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  |  |  |  | unrealized |  |  | unrealized |  |  |  |
|  | Amortized |  |  | holding |  |  | holding |  |  | Aggregate |
|  | cost basis** |  |  | gains |  |  | (losses) |  |  | fair value* |
|  | US$ thousands |
At December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities and government debt securities |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 1,610 |  |  |  | - |  |  |  | (22 | ) |  |  | 1,588 |
Non-Current |  |  | 46,052 |  |  |  | - |  |  |  | (778 | ) |  |  | 45,274 |
|  |  | 47,662 |  |  |  | - |  |  |  | (800 | ) |  |  | 46,862 |
At December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 7,798 |  |  |  | - |  |  |  | (49 | ) |  |  | 7,749 |
Non-Current |  |  | 5,976 |  |  |  | - |  |  |  | (95 | ) |  |  | 5,881 |
|  |  | 13,774 |  |  |  | - |  |  |  | (144 | ) |  |  | 13,630 |
| * | Fair value is being determined using quoted market prices in active markets (Level 2).
| ** | Including accrued interest in the amount of US$ 77 thousand and US$ 450 thousand as of December 31, 2017 and 2018 respectively. The accrued interest is presented as part of other account receivable on the balance sheet.
Schedule of Reconciliation of Marketable Securities |
Activity in marketable securities in 2018 |  | US$ thousands |
Balance at January 1, 2018 |  |  | 13,774 |
Purchases of marketable securities |  |  | 41,670 |
Discount on marketable securities, net |  |  | (32 | )
Proceeds from maturity of marketable securities |  |  | (7,750 | )
Balance at December 31, 2018 |  |  | 47,662 |
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, 2018: |
|  | 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 |  |  | (679 | ) |  |  | 41,024 |  |  |  | (121 | ) |  |  | 5,838 |  |  |  | (800 | ) |  |  | 46,862 |

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