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Stock-Based Compensation (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Oct. 31, 2014
Mar. 31, 2018
Dec. 31, 2017
Stock-Based Compensation (Textual)      
Options outstanding   7,665,500 7,190,500
Stock option expense recognize period   2 years 3 months 19 days  
Pre-vesting forfeiture rate   10.00%  
Unrecognized compensation expense   $ 409  
2006 Equity Incentive Plan [Member]      
Stock-Based Compensation (Textual)      
Shares reserved for company's employees   1,720,000  
Options outstanding   365,500  
2006 Non-Employee Director Stock Option Plan [Member]      
Stock-Based Compensation (Textual)      
Shares reserved for company's employees   700,000  
2014 Stock Incentive Plan [Member]      
Stock-Based Compensation (Textual)      
Shares reserved for company's employees 7,390,355