Annual report pursuant to Section 13 and 15(d)

Significant Customers and Geographic Data Revenues and Accounts Receivable by Customers (Details)

v3.19.1
Significant Customers and Geographic Data Revenues and Accounts Receivable by Customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue, Major Customer [Line Items]      
Property and equipment, net of depreciation $ 545 $ 911  
Revenues 25,013    
Customer Concentration Risk | Revenues | Customer A [Member]      
Revenue, Major Customer [Line Items]      
Revenues   4,945 $ 4,402
Customer Concentration Risk | Current Receivables | Customer A [Member]      
Revenue, Major Customer [Line Items]      
Accounts Receivable 841    
Customer Concentration Risk | Current Receivables | Customer B      
Revenue, Major Customer [Line Items]      
Accounts Receivable 782 $ 814  
Customer Concentration Risk | Current Receivables | Customer C      
Revenue, Major Customer [Line Items]      
Accounts Receivable $ 692