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Major Customers as a Percentage of Net Accounts Receivable Balances (Details)
Dec. 31, 2017
Dec. 31, 2016
Ingram Micro Inc.    
Percent of net accounts receivable balances 37.00% 49.00%
Threshold percentage for disclosure 10.00% 10.00%
BlueStar, Inc.    
Percent of net accounts receivable balances 23.00% 30.00%
Threshold percentage for disclosure 10.00% 10.00%
ScanSource, Inc.    
Percent of net accounts receivable balances 10.00%
Threshold percentage for disclosure 10.00% 10.00%
Ingram Micro Pan Europe GmbH    
Percent of net accounts receivable balances 10.00%
Threshold percentage for disclosure 10.00% 10.00%