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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Shareholders' Equity [Abstract] |
Fair Value Assumptions | The fair value of each option award is estimated on the date of grant using the Black-Scholes-Merton option-pricing model that used the weighted average assumptions in the following table and recognized over the vesting period of four years. The risk‑free rate for the expected term of the option is based on the U.S. Treasury yield curve in effect at the time of grant.
| 2017 Grant |  | 2016 Grant
Valuation assumptions: |  |  |
Dividend yield * | 0 |  | 0
Expected volatility | 66% |  | 66%
Risk-free interest rate | 1.87% |  | 1.38%
Expected life (years) ** | 4.8 |  | 4.8
*The option grant was made prior to the dividend distribution. As such, the valuation assumptions reflect the Company’s previous record of not paying dividends.
Stock Option Activity | Share option activity during the past three years is as follows:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  |  |  |  | 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 |  |  | 1,173,433 |  |  |  | 2.80 |  |  |  | 1,653,434 |  |  |  | 2.82 |  |  |  | 1,151,121 |  |  |  | 3.28 |
Granted |  |  | - |  |  |  | - |  |  |  | 154,600 |  |  |  | 2.75 |  |  |  | 527,500 |  |  |  | 1.92 |
Forfeited and cancelled |  |  | (43,159 | ) |  |  | 2.53 |  |  |  | (152,698 | ) |  |  | 2.77 |  |  |  | (25,187 | ) |  |  | 5.00 |
Exercised |  |  | (610,489 | ) |  |  | 2.79 |  |  |  | (481,903 | ) |  |  | 2.87 |  |  |  | - |  |  |  | 0.00 |
Outstanding at year end |  |  | 519,785 |  |  |  | 3.16 |  |  |  | 1,173,433 |  |  |  | 2.80 |  |  |  | 1,653,434 |  |  |  | 2.82 |
Vested at year end |  |  | 217,976 |  |  |  | 2.85 |  |  |  | 490,086 |  |  |  | 3.36 |  |  |  | 725,466 |  |  |  | 3.32 |
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, 2018 |  |  | 519,785 |  |  |  | 3.16 |  |  |  | 4.14 |  |  |  | 1,886 |
Vested and expected to vest at December 31, 2018 |  |  | 508,684 |  |  |  | 3.16 |  |  |  | 4.14 |  |  |  | 1,846 |
Exercisable at December 31, 2018 |  |  | 217,976 |  |  |  | 2.85 |  |  |  | 3.14 |  |  |  | 855 |
Information about Share Options | The following table summarizes information about share options at December 31, 2018:
|  |  |  |  |  |  |  | Weighted |
|  |  |  |  |  |  |  | average |
|  |  |  |  |  |  |  | remaining |
|  |  |  |  |  |  |  | Contractual term |
|  | Number of |  |  |  |  |  | (years) |
|  | outstanding |  |  | Number |  |  | of outstanding |
Exercise price US$ |  | options |  |  | exercisable |  |  | options |
0-2 |  |  | 179,154 |  |  |  | 73,797 |  |  |  | 4.22 |
2-5 |  |  | 340,631 |  |  |  | 144,179 |  |  |  | 4.10 |
|  |  | 519,785 |  |  |  | 217,976 |  |  |  | 4.14 |
Information about Nonvested Options | The following table summarizes information about non-vested options at December 31, 2018:
|  |  |  |  | Weighted |
|  |  |  |  | average |
|  |  |  |  | grant- date |
|  | Options |  |  | fair value |
Balance at January 1, 2018 |  |  | 683,347 |  |  |  | 1.58 |
Granted |  |  | - |  |  |  | - |
Vested |  |  | (348,962 | ) |  |  | 1.32 |
Forfeited |  |  | (32,576 | ) |  |  | 1.45 |
Balance at December 31, 2018 |  |  | 301,809 |  |  |  | 2.04 |
Restricted Share Unit Activity | The following table summarizes information about RSUs at December 31, 2018:
|  | RSUs |
Balance at January 1, 2018 |  |  | 86,500 |
Granted |  |  | 1,051,054 |
Forfeited |  |  | (2,700 | )
Balance at December 31, 2018 |  |  | 1,134,854 |

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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