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Major Customers Accounted for at Least 10% of Total Revenues (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Ingram Micro, Inc.        
Percent of total revenues 33.00% 27.00% 39.00% 25.00%
Threshold percentage for disclosure 10.00% 10.00% 10.00% 10.00%
BlueStar, Inc.        
Percent of total revenues 17.00% 21.00% 16.00% 23.00%
Threshold percentage for disclosure 10.00% 10.00% 10.00% 10.00%
ScanSource, Inc.        
Percent of total revenues 26.00% 15.00% 20.00% 14.00%
Threshold percentage for disclosure 10.00% 10.00% 10.00% 10.00%
Spinal Modulation, Inc.        
Percent of total revenues 12.00% 13.00%
Threshold percentage for disclosure 10.00% 10.00% 10.00% 10.00%