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Shareholders' Equity (Tables)
12 Months Ended
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