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Share-Based Compensation (Stock Options) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Apr. 30, 2016
Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]            
Expected stock price volatility 71.40% 71.00%        
Expected life of options (years) 6 years 5 years 6 months 0 years      
Expected dividend yield 0.00% 0.00%        
Risk free interest rate 1.20% 1.70%        
A & R 2015 Plan | Officers, directors and employees            
Number of Options            
Granted (in shares) 1,825,700 305,278        
A & R 2015 Plan | Officers, directors and employees | Minimum            
Stock Options, Additional Disclosures            
Vesting period 3 years          
A & R 2015 Plan | Officers, directors and employees | Maximum            
Stock Options, Additional Disclosures            
Vesting period 4 years          
A & R 2015 Plan | Employees, directors and consultants            
Stock Options, Additional Disclosures            
Common stock reserved for issuance (in shares)         2,400,000  
Available for future issuance 457,200          
2015 Plan            
Stock Options, Additional Disclosures            
Vested   104,907        
2015 Plan | Employees, directors and consultants            
Stock Options, Additional Disclosures            
Common stock reserved for issuance (in shares)           320,615
Vested 276,248          
Forfeited 83,742 0 0      
Inducement Plan            
Stock Options, Additional Disclosures            
Common stock reserved for issuance (in shares)       300,000    
Inducement Plan | Officers and Employees            
Number of Options            
Granted (in shares) 198,000          
Stock Options, Additional Disclosures            
Vesting period 4 years          
Inducement Plan | Employees, directors and consultants            
Stock Options, Additional Disclosures            
Available for future issuance 457,200          
Stock options            
Number of Options            
Outstanding, Number, Beginning Balance (in shares) 302,842          
Granted (in shares) 2,023,700 305,278        
Exercised (in shares)   (2,436)        
Forfeited/Cancelled (in shares) (83,742)          
Outstanding, Number, Ending Balance (in shares) 2,242,800 302,842        
Vested and exercisable (in shares) 373,158          
Vested and expected to vest (in shares) 2,242,800          
Weighted Average Exercise Price            
Outstanding, Weighted Average Exercise Price, Beginning Balance (in dollars per share) $ 2.43          
Granted (in dollars per share) 10.07 $ 2.42        
Exercised (in dollars per share)   1.34        
Forfeited/Cancelled (in dollars per share) 9.12          
Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) 9.07 $ 2.43        
Vested and exercisable (in dollars per share) 5.86          
Vested and expected to vest (in dollars per share) $ 9.07          
Stock Options, Additional Disclosures            
Options, Outstanding, Weighted Average Remaining Contractual Term (years) 9 years 5 months 23 days 9 years 7 months 6 days        
Vested and exercisable (years) 9 years 22 days          
Vested and expected to vest (years) 9 years 5 months 23 days          
Options, Outstanding, Aggregate Intrinsic Value $ (2,759,000) $ 1,031,000        
Vested and exercisable 740,000          
Vested and expected to vest $ (2,759,000)          
Common stock aggregate intrinsic value of exercise price $ 5.83 $ 7.84        
Weighted average fair value per share of options granted 6.37 1.50        
Weighted average fair value per share of options vested $ 4.59 $ 1.05        
Restricted stock awards | Minimum            
Stock Options, Additional Disclosures            
Vesting period 6 months          
Restricted stock awards | Maximum            
Stock Options, Additional Disclosures            
Vesting period 24 months