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Revenue Recognition (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Obligation
Customer
Mar. 31, 2018
USD ($)
Customer
Distributor
Licensee
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.  
Development revenue recognized | $ $ 737 $ 917
Customer Concentration Risk [Member] | Revenue Recognized [Member]    
Concentration Risk [Line Items]    
Number of customers 2 4
Concentration risk percentage 57.00% 66.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]    
Concentration Risk [Line Items]    
Number of customers 2 3
Concentration risk percentage 61.00% 75.00%
Number of distributors | Distributor   2
Number of licensee | Licensee   1