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Stock Options, Non-qualified Options (Details) - Nonqualified Stock Options [Member]
6 Months Ended
Nov. 01, 2017
shares
Mar. 01, 2017
shares
Nov. 16, 2015
shares
Jun. 30, 2018
Installment
Executives [Member]        
Stock Options [Abstract]        
Vesting period       4 years
Executives [Member] | Vesting One Year Following Date of Hire [Member]        
Stock Options [Abstract]        
Vesting percentage       25.00%
Executives [Member] | Vesting in 36 Monthly Installments Thereafter [Member]        
Stock Options [Abstract]        
Vesting percentage       75.00%
Number of monthly installments for vesting | Installment       36
SVP, General Counsel and Secretary [Member]        
Stock Options [Abstract]        
Issue date       Nov. 16, 2015
25% vesting date       Oct. 30, 2016
Number of options (in shares)     80,000  
SVP, Regulatory Affairs [Member]        
Stock Options [Abstract]        
Issue date       Mar. 01, 2017
25% vesting date       Feb. 28, 2018
Number of options (in shares)   80,000    
Chief Financial Officer [Member]        
Stock Options [Abstract]        
Issue date       Nov. 01, 2017
25% vesting date       Oct. 31, 2018
Number of options (in shares) 200,000