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Major Customers Accounted for at Least 10% of Net Accounts Receivable Balances (Details)
Mar. 31, 2018
Dec. 31, 2017
Ingram Micro, Inc.    
Percent of net accounts receivable balances 40.00% 37.00%
Threshold percentage for disclosure 10.00% 10.00%
BlueStar, Inc.    
Percent of net accounts receivable balances 31.00% 23.00%
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%