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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
item
Customers
Dec. 31, 2015
USD ($)
Provision for doubtful accounts $ 20 $ 20
Number of major customers | Customers 3  
Percentage of revenue contributed by major customers 35.00%  
Impairment of intangible assets  
Number of operating segments | item 1  
Number of reporting units | item 1  
Current deferred tax assets reclassified to noncurrent deferred tax assets, resulting from adoption of ASU 2015-17 $ 1,118 $ 950
Current deferred tax liabilities reclassified to noncurrent deferred tax liabilities, resulting from adoption of ASU 2015-17 $ 111  
Maximum [Member]    
Estimated useful life 3 years