Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
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, 2019
Dec. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Customer A | REVENUES            
Concentration Risk [Line Items]            
Concentration risk, percentage     6.00% 65.00% 22.00% 65.00%
Customer A | ACCOUNTS RECEIVABLE            
Concentration Risk [Line Items]            
Concentration risk, percentage 61.00% 65.00%        
Customer B | REVENUES            
Concentration Risk [Line Items]            
Concentration risk, percentage     26.00% 9.00% 23.00% 11.00%
Customer B | ACCOUNTS RECEIVABLE            
Concentration Risk [Line Items]            
Concentration risk, percentage 9.00% 3.00%        
Customer C | REVENUES            
Concentration Risk [Line Items]            
Concentration risk, percentage     5.00% 0.00% 10.00% 0.00%
Customer C | ACCOUNTS RECEIVABLE            
Concentration Risk [Line Items]            
Concentration risk, percentage 1.00% 2.00%