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Shareholders' Equity, 2016 Warrants and New Warrants (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jul. 21, 2017
USD ($)
Investor
Form
$ / shares
shares
Feb. 17, 2017
USD ($)
Investor
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
2016 Warrants and New Warrants [Abstract]          
Proceeds from exercise of warrants | $     $ 4,074 $ 0 $ 0
Warrant exercise agreement, number of forms | Form 3        
Warrants issued (in shares)     2,779,221    
Warrants outstanding (in shares)     2,779,221    
2016 Warrants [Member]          
2016 Warrants and New Warrants [Abstract]          
Number of common stock shares called by warrants (in shares)   625,000      
Warrants exercise price (in dollars per share) | $ / shares   $ 3.25      
Warrant exercise period     5 years    
Proceeds from exercise of warrants | $   $ 2,000      
New Warrants [Member]          
2016 Warrants and New Warrants [Abstract]          
Warrant exercise period     5 years    
Noncash charge to shareholder expense included in general and administrative expenses | $   $ 1,100      
New Warrants [Member] | Investors Group [Member]          
2016 Warrants and New Warrants [Abstract]          
Number of common stock shares called by warrants (in shares)   200,000      
Warrants exercise price (in dollars per share) | $ / shares   $ 5.50      
New Warrants [Member] | Investor [Member]          
2016 Warrants and New Warrants [Abstract]          
Number of warrant holders | Investor   1      
Number of common stock shares called by warrants (in shares)   212,500      
Warrants exercise price (in dollars per share) | $ / shares   $ 3.25      
First Form - 2016 Warrants [Member]          
2016 Warrants and New Warrants [Abstract]          
Number of warrant holders | Investor 2        
Number of common stock shares called by warrants (in shares) 226,923        
Warrants exercise price (in dollars per share) | $ / shares $ 3.25        
Warrant exercise period     5 years    
First Form - July 2017 Warrants [Member]          
2016 Warrants and New Warrants [Abstract]          
Number of common stock shares called by warrants (in shares) 226,923        
Warrants exercise price (in dollars per share) | $ / shares $ 5.50        
Warrant exercise period     5 years    
Second Form - 2016 Warrants [Member]          
2016 Warrants and New Warrants [Abstract]          
Number of warrant holders | Investor 1        
Number of common stock shares called by warrants (in shares) 540,000        
Warrants exercise price (in dollars per share) | $ / shares $ 3.25        
Warrant exercise period     5 years    
Second Form - July 2017 Warrants [Member]          
2016 Warrants and New Warrants [Abstract]          
Number of common stock shares called by warrants (in shares) 270,000        
Warrants exercise price (in dollars per share) | $ / shares $ 3.25        
Warrant exercise period     5 years    
Third Form - 2016 Warrants [Member]          
2016 Warrants and New Warrants [Abstract]          
Number of warrant holders | Investor 1        
Number of common stock shares called by warrants (in shares) 1,000,000        
Warrants exercise price (in dollars per share) | $ / shares $ 3.25        
Warrant exercise period     2 years    
Third Form Part 1 - July 2017 Warrants [Member]          
2016 Warrants and New Warrants [Abstract]          
Number of common stock shares called by warrants (in shares) 500,000        
Warrants exercise price (in dollars per share) | $ / shares $ 5.50        
Warrant exercise period     2 years    
Third Form Part 2 - July 2017 Warrants [Member]          
2016 Warrants and New Warrants [Abstract]          
Number of common stock shares called by warrants (in shares) 500,000        
Warrants exercise price (in dollars per share) | $ / shares $ 3.25        
Warrant exercise period     2 years    
July 2017 Warrants [Member]          
2016 Warrants and New Warrants [Abstract]          
Number of common stock shares called by warrants (in shares) 1,496,923        
Warrant exercise period     5 years    
Proceeds from exercise of warrants | $ $ 5,740        
Noncash charge to shareholder expense included in general and administrative expenses | $ $ 3,000        
Weighted average price (in dollars per share) | $ / shares $ 4.34