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Revenue Recognition (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Obligation
Customer
Sep. 30, 2017
USD ($)
Customer
Concentration Risk [Line Items]        
Number of performance obligation | Obligation     1  
Payment terms with customers     The Company’s contracts do not involve financing elements as payment terms with customers are less than one year.  
Concentration risk percentage 100.00% 100.00% 100.00% 100.00%
Development revenue recognized | $ $ 454 $ 1,306 $ 2,270 $ 2,856
Customer Concentration Risk [Member] | Revenue Recognized [Member]        
Concentration Risk [Line Items]        
Number of customers     2 6
Concentration risk percentage     58.00% 61.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]        
Concentration Risk [Line Items]        
Number of customers     3 4
Concentration risk percentage     72.00% 78.00%