Annual report pursuant to Section 13 and 15(d)

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

v3.7.0.1
Significant Customers and Geographic Data Revenues and Accounts Receivable by Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue, Major Customer [Line Items]                      
Revenues $ 9,321 $ 7,110 $ 6,515 $ 8,736 $ 10,119 $ 9,602 $ 8,764 $ 5,969 $ 31,682 $ 34,454 $ 26,521
Customer Concentration Risk | Revenues                      
Revenue, Major Customer [Line Items]                      
Revenues                 31,682 34,454 $ 26,521
Customer Concentration Risk | Revenues | Customer A                      
Revenue, Major Customer [Line Items]                      
Revenues                 $ 4,402 4,375  
Customer Concentration Risk | Current Receivables | Customer A                      
Revenue, Major Customer [Line Items]                      
Accounts Receivable         1,099         1,099  
Customer Concentration Risk | Current Receivables | Customer B                      
Revenue, Major Customer [Line Items]                      
Accounts Receivable         748         748  
Customer Concentration Risk | Current Receivables | Customer C                      
Revenue, Major Customer [Line Items]                      
Accounts Receivable         1,144         1,144  
Customer Concentration Risk | Current Receivables | Customer D                      
Revenue, Major Customer [Line Items]                      
Accounts Receivable         $ 1,173         $ 1,173