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Major Customers as a Percentage of Net Accounts Receivable Balances (Details)
Mar. 31, 2019
Dec. 31, 2018
Ingram Micro Inc.    
Percent of net accounts receivable balances 49.00% 41.00%
Threshold percentage for disclosure 10.00% 10.00%
BlueStar, Inc.    
Percent of net accounts receivable balances 26.00% 19.00%
Threshold percentage for disclosure 10.00% 10.00%