Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies - Concentration of Credit Risk and Significant Customers (Details)

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Basis of Presentation and Significant Accounting Policies - Concentration of Credit Risk and Significant Customers (Details) - Customer Concentration Risk
3 Months Ended 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Customer A | REVENUES            
Concentration Risk [Line Items]            
Concentration risk, percentage     65.00% 0.00% 65.00% 0.00%
Customer A | ACCOUNTS RECEIVABLE            
Concentration Risk [Line Items]            
Concentration risk, percentage 59.00% 56.00%        
Customer B | REVENUES            
Concentration Risk [Line Items]            
Concentration risk, percentage     9.00% 59.00% 11.00% 59.00%
Customer B | ACCOUNTS RECEIVABLE            
Concentration Risk [Line Items]            
Concentration risk, percentage 9.00% 12.00%