Annual report pursuant to Section 13 and 15(d)

STOCK???BASED COMPENSATION - Fair Value Of Options (Details)

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STOCK‑BASED COMPENSATION - Fair Value Of Options (Details) - Stock Option Plan - Stock options - USD ($)
Mar. 16, 2017
Jul. 19, 2016
Dec. 01, 2013
Jun. 14, 2013
June 14, 2013        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility       45.00%
Expected dividends       $ 0
Expected term (in years)       6 years 3 months
Risk free rate       1.35%
December 1, 2013        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility     45.00%  
Expected dividends     $ 0  
Expected term (in years)     6 years 3 months  
Risk free rate     1.83%  
July 19, 2016        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility   55.00%    
Expected dividends   $ 0    
Expected term (in years)   5 years 9 months    
Risk free rate   1.22%    
March 16, 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected volatility 18.00%      
Expected dividends $ 0      
Expected term (in years) 6 years 3 months      
Risk free rate 2.23%