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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
 
Expected Volatility
 
Risk-free Interest Rate
 
Expected Term
 
Dividend
Rate
December 31, 2015:
 
 
 
 
 
 
 
Employees
64%
 
1.2%
 
4
 
0
%
Officers and non-employee directors
81%
 
1.8%
 
8
 
0
%
December 31, 2014:

 

 

 

Employees
66%
 
1.2%
 
4
 
0
%
Officers and non-employee directors
80%
 
2.3%
 
8
 
0
%
December 31, 2013:

 

 

 

Employees
85%
 
0.9%
 
5
 
0
%
Officers and non-employee directors
81%
 
1.6%
 
8
 
0
%