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Shareholders' Equity (Tables)
12 Months Ended
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