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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Held-to-Maturity Securities | The Company's investment in marketable securities as of December 31, 2016 and 2017 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, 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 |
At December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 16,390 |  |  |  | - |  |  |  | (97 | ) |  |  | 16,293 |
Non-Current |  |  | 7,815 |  |  |  | - |  |  |  | (62 | ) |  |  | 7,753 |
|  |  | 24,205 |  |  |  | - |  |  |  | (159 | ) |  |  | 24,046 |
* | Fair value is being determined using quoted market prices in active markets (Level 1).
** | Including accrued interest in the amount of US$ 173 thousand and US$ 77 thousand as of December 31, 2016 and 2017 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 2017 |  | US$ thousands |
Balance at January 1, 2017 |  |  | 24,205 |
Purchases of marketable securities |  |  | 5,961 |
Discount on marketable securities, net |  |  | (217 | )
Proceeds from maturity of marketable securities |  |  | (16,175 | )
Balance at December 31, 2017 |  |  | 13,774 |
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, 2017:
|  | Less than 12 months |  |  | 12 months or more |  |  | Total |
|  | Unrealized Losses |  |  | Fair value |  |  | Unrealized Losses |  |  | Fair value |  |  | Unrealized Losses |  |  | Fair value |
Held to maturity:
Corporate debt securities |  |  | (95 | ) |  |  | 5,881 |  |  |  | (49 | ) |  |  | 7,749 |  |  |  | (144 | ) |  |  | 13,630 |

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