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Stock-based Compensation - Director Compensation Program (Details) - RSUs - Non-employee director
1 Months Ended
Oct. 31, 2017
USD ($)
Dec. 31, 2016
Installment
Stock-based compensation    
One time grant of shares, value $ 125,000  
Pro rata shares grant, value 225,000  
Number of annual installments | Installment   2
Annual grant of shares, value $ 225,000