Quarterly report pursuant to Section 13 or 15(d)

Credit Risk and Concentrations (Details Textual)

v3.19.1
Credit Risk and Concentrations (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Vendor
Dec. 31, 2018
USD ($)
Vendor
Accounts Receivable [Member] | Customer A [Member]    
Credit Risk and Concentrations (Textual)    
Concentration risk, percentage 37.00%  
Accounts Receivable [Member] | Customer D [Member]    
Credit Risk and Concentrations (Textual)    
Concentration risk, percentage 22.00% 26.00%
Accounts Receivable [Member] | Customer E [Member]    
Credit Risk and Concentrations (Textual)    
Concentration risk, percentage 11.00% 13.00%
Accounts Receivable [Member] | Customer C [Member]    
Credit Risk and Concentrations (Textual)    
Concentration risk, percentage 11.00% 30.00%
Accounts Payable [Member] | Vendor One [Member]    
Credit Risk and Concentrations (Textual)    
Concentration risk, percentage 43.00% 49.00%
Purchases from vendors | $ $ 0 $ 0
Number of vendors 1 1
Total purchases [Member]    
Credit Risk and Concentrations (Textual)    
Number of vendors 2 1
Total purchases [Member] | Vendor One [Member]    
Credit Risk and Concentrations (Textual)    
Concentration risk, percentage 56.00% 84.00%
Total purchases [Member] | Vendor Two [Member]    
Credit Risk and Concentrations (Textual)    
Concentration risk, percentage 44.00%