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Stock Incentive Plans - Narrative (Details) - shares
12 Months Ended
Dec. 15, 2016
Nov. 07, 2016
Oct. 15, 2014
Dec. 31, 2017
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vested or expected to vest (in shares)       9,960  
Nonvested shares (in shares)       2,915  
Chief Financial Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted, options (in shares)   280,000      
Chief Financial Officer | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)   233,863      
Management Incentive Plan 2014          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of common stock for distribution     2.00%    
Vesting period     4 years    
Vesting Year 1     25.00%    
Common stock subject to outstanding awards (in shares)       24,644  
Management Incentive Plan 2014 | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vested or expected to vest (in shares)       210,000  
Vested, options (in shares)       3,369 6,591
Management Incentive Plan 2014 | Chief Financial Officer | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares)   233,863      
Management Incentive Plan 2014 | Chief Financial Officer | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted, options (in shares)   280,000      
Vested, options (in shares)   70,000   70,000  
Management Incentive Plan 2014 | With Different Striking Prices          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of common stock for distribution     5.50%    
2016 Equity Compensation Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized (in shares) 5,348,613        
Shares that can be grated per employee (in shares) 3,000,000        
Maximum number of options and stock appreciation rights that can be granted per employee in one year (in shares) 3,000,000        
Maximum shares to be granted to non employee director in one year (in shares) 500,000        
2016 Equity Compensation Plan | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vested or expected to vest (in shares)       1,180,086  
Vested, options (in shares)       828,085