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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2015
Shareholders' Equity [Abstract] |
Fair Value Assumptions |
|  | 2015 Grant |  |  | 2014 Grant |
Valuation assumptions: |  |  |  |  |  |
Dividend yield |  |  | 0 |  |  |  | 0 |
Expected volatility |  |  | 67%-68 | % |  |  | 64%-71 | %
Risk-free interest rate |  |  | 1.6%-2.16 | % |  |  | 1.67%-2.3 | %
Expected life (years) |  |  | 4.8 |  |  |  | 4.8-6.4 |
Vesting period (years) |  |  | 4 |  |  |  | 4 |
Stock Option Activity |
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  |  |  |  | Weighted |  |  |  |  |  | Weighted |  |  |  |  |  | Weighted |
|  | Number |  |  | average |  |  | Number |  |  | average |  |  | Number |  |  | average |
|  | of |  |  | exercise |  |  | of |  |  | exercise |  |  | of |  |  | exercise |
|  | options |  |  | price US$ |  |  | options |  |  | price US$ |  |  | options |  |  | price US$ |
Outstanding at January 1 |  |  | 833,799 |  |  |  | 3.34 |  |  |  | 735,519 |  |  |  | 2.99 |  |  |  | 1,195,085 |  |  |  | 3.15 |
Granted |  |  | 464,335 |  |  |  | 2.99 |  |  |  | 296,000 |  |  |  | 3.53 |  |  |  | 75,000 |  |  |  | 1.73 |
Forfeited and cancelled |  |  | (122,952 | ) |  |  | 2.95 |  |  |  | (108,724 | ) |  |  | 2.47 |  |  |  | (174,915 | ) |  |  | 2.96 |
Exercised |  |  | (24,061 | ) |  |  | 1.40 |  |  |  | (88,996 | ) |  |  | 2.14 |  |  |  | (359,651 | ) |  |  | 3.26 |
Outstanding at year end |  |  | 1,151,121 |  |  |  | 3.28 |  |  |  | 833,799 |  |  |  | 3.34 |  |  |  | 735,519 |  |  |  | 2.99 |
Vested at year end |  |  | 461,192 |  |  |  | 3.48 |  |  |  | 423,291 |  |  |  | 3.56 |  |  |  | 368,016 |  |  |  | 3.42 |
Schedule of Options Outstanding |
|  |  |  |  |  |  |  | Weighted |  |  | Aggregate |
|  | Number |  |  | Weighted |  |  | Average |  |  | intrinsic |
|  | of |  |  | average |  |  | Remaining |  |  | Value (in |
|  | options |  |  | exercise |  |  | Contractual |  |  | US$ |
|  | outstanding |  |  | price US$ |  |  | term (years) |  |  | thousands) |
Outstanding as of December 31, 2015 |  |  | 1,151,121 |  |  |  | 3.28 |  |  |  | 4.52 |  |  |  | 45.10 |
Vested and expected to vest at |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2015 |  |  | 1,095,927 |  |  |  | 3.28 |  |  |  | 4.52 |  |  |  | 41.00 |
Exercisable at December 31, 2015 |  |  | 461,192 |  |  |  | 3.48 |  |  |  | 5.36 |  |  |  | 38.10 |
Information about Share Options |
|  |  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  |  | average |
|  |  | Number of |  |  |  |  |  | remaining |
|  |  | outstanding |  |  | Number |  |  | contractual |
Exercise price US$ |  |  | options |  |  | exercisable |  |  | life in years |
0-2 |  |  |  | 122,187 |  |  |  | 94,893 |  |  | 6.8 |
3-5 |  |  |  | 1,018,934 |  |  |  | 356,299 |  |  | 5.6 |
6-7 |  |  |  | 10,000 |  |  |  | 10,000 |  |  | 0.6 |
|  |  |  | 1,151,121 |  |  |  | 461,192 |  |  |  |
Information about Nonvested Options |
|  |  |  |  | Weighted |
|  |  |  |  | average |
|  |  |  |  | grant- date |
|  | Options |  |  | fair value |
Balance at January 1, 2015 |  |  | 410,508 |  |  |  | 1.48 |
Granted |  |  | 464,335 |  |  |  | 1.64 |
Vested |  |  | (78,462 | ) |  |  | 1.51 |
Forfeited |  |  | (106,452 | ) |  |  | 1.75 |
Balance at December 31, 2015 |  |  | 689,929 |  |  |  | 1.55 |

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- Definition Tabular disclosure of the following for fully vested share options (or share units) and share options expected to vest at the date of the latest statement of financial position: the number, weighted-average exercise price (or conversion ratio), aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term of options (or share units) outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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