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Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Summary of employee option activity under the 2007 Plan |
|  |  | Number of options |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term (in years) |  |  | Aggregate intrinsic value |
| Outstanding at January 1, 2017 |  |  | 473,367 |  |  | $ | 4.58 |  |  |  | 5.10 |  |  | $ | 991 |
| Granted |  |  | - |  |  | $ | - |  |  |  |  |  |  |  |  |
| Exercised |  |  | (132,808 | ) |  | $ | 4.40 |  |  |  |  |  |  |  |  |
| Forfeited |  |  | (31,250 | ) |  | $ | 6.18 |  |  |  |  |  |  |  |  |
| Outstanding at December 31, 2017 |  |  | 309,309 |  |  | $ | 4.38 |  |  |  | 3.97 |  |  | $ | 1,237 |
| Exercisable at December 31, 2017 |  |  | 258,059 |  |  | $ | 3.84 |  |  |  | 3.45 |  |  | $ | 1,171 |
Schedule of options outstanding |
| Exercise price |  | Options outstanding |  |  | Weighted average remaining contractual life (years) |  |  | Weighted average exercise price |  |  | Options exercisable |  |  | Weighted average exercise price of exercisable options |
| In $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| 1.01-2 |  |  | 20,000 |  |  |  | 0.98 |  |  | $ | 1.12 |  |  |  | 20,000 |  |  | $ | 1.12 |
| 2.01-3 |  |  | 87,667 |  |  |  | 2.25 |  |  | $ | 2.31 |  |  |  | 87,667 |  |  | $ | 2.31 |
| 3.01-4 |  |  | 109,142 |  |  |  | 3.77 |  |  | $ | 4.00 |  |  |  | 109,142 |  |  | $ | 4.00 |
| 5.01-6 |  |  | 6,250 |  |  |  | 5.61 |  |  | $ | 6.00 |  |  |  | - |  |  | $ | - |
| 6.01-7 |  |  | 31,250 |  |  |  | 6.87 |  |  | $ | 6.89 |  |  |  | - |  |  | $ | - |
| 8.01-9 |  |  | 55,000 |  |  |  | 6.35 |  |  | $ | 8.01 |  |  |  | 41,250 |  |  | $ | 8.01 |
|  |  |  | 309,309 |  |  |  | 3.97 |  |  | $ | 4.38 |  |  |  | 258,059 |  |  | $ | 3.84 |
Schedule of accumulated other comprehensive income (loss) |
|  |  | December 31, |
|  |  | 2015 |  |  | 2016 |  |  | 2017 |
| Accumulated realized and unrealized gain (loss) on available-for-sale securities, net |  | $ | 35 |  |  | $ | 40 |  |  | $ | (58 | )
| Accumulated foreign currency translation adjustments |  |  | (6,756 | ) |  |  | (7,494 | ) |  |  | 115 |
| Accumulated unrealized gain on derivative instruments, net |  |  | 26 |  |  |  | 26 |  |  |  | 26 |
| Total other comprehensive income (loss) |  | $ | (6,695 | ) |  | $ | (7,428 | ) |  | $ | 83 |

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