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Stock-Based Compensation and Stock Options - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 31, 2017
Mar. 31, 2016
Sep. 30, 2015
Jan. 31, 2012
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award                
Options granted (in shares)         400,000 150,000 400,000  
Exercise price of employee option shares of common stock (in dollars per share)         $ 6.95 $ 8.55 $ 8.07  
Options forfeited (in shares)         50,000 325,000 50,000  
Options outstanding (in shares)         950,000 600,000 775,000 425,000
Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award                
Allocated share-based compensation expense (reversal of)         $ 1,000,000 $ 933,000 $ 401,000  
Stock Options | Employee Options 2012                
Share-based Compensation Arrangement by Share-based Payment Award                
Options granted (in shares)       100,000        
Exercise price of employee option shares of common stock (in dollars per share)       $ 28.98        
Options vest and become exercisable annually (in shares)       25,000        
Options canceled (in shares)             25,000  
Options forfeited (in shares)             25,000  
Options vested (in shares)         50,000      
Options outstanding (in shares)         50,000,000      
Unrecognized stock-based compensation expense         $ 0      
Stock Options | Employee Options 2015                
Share-based Compensation Arrangement by Share-based Payment Award                
Options granted (in shares)     400,000          
Exercise price of employee option shares of common stock (in dollars per share)     $ 8.07          
Options vested (in shares)         400,000      
Options vest and become exercisable quarterly (in shares)     50,000          
Options outstanding (in shares)         400,000      
Unrecognized stock-based compensation expense         $ 0      
Stock Options | Employee Options 2016                
Share-based Compensation Arrangement by Share-based Payment Award                
Options granted (in shares)   150,000            
Exercise price of employee option shares of common stock (in dollars per share)   $ 8.55            
Options vest and become exercisable annually (in shares)   37,500            
Options outstanding (in shares)         100,000      
Unrecognized stock-based compensation expense         $ 258,000      
Unrecognized compensation expense, period for recognition (in years)         2 years 2 months 6 days      
Stock Options | Employee Options 2017                
Share-based Compensation Arrangement by Share-based Payment Award                
Options granted (in shares) 400,000              
Exercise price of employee option shares of common stock (in dollars per share) $ 6.95              
Options vested (in shares)         0      
Options vest and become exercisable quarterly (in shares) 50,000              
Options outstanding (in shares)         400,000      
Unrecognized stock-based compensation expense         $ 1,100,000      
Unrecognized compensation expense, period for recognition (in years)         2 years      
Executive Officer | Stock Options | Employee Options 2016                
Share-based Compensation Arrangement by Share-based Payment Award                
Options canceled (in shares)         12,500      
Options forfeited (in shares)         37,500      
Options vested (in shares)         25,000      
Allocated share-based compensation expense (reversal of)         $ (19,000)