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Major Customers Accounted for at Least 10% of Total Revenues (Details)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Ingram Micro, Inc.    
Percent of total revenues 45.00% 24.00%
Threshold percentage for disclosure 10.00% 10.00%
BlueStar, Inc.    
Percent of total revenues 15.00% 25.00%
Threshold percentage for disclosure 10.00% 10.00%
ScanSource, Inc.    
Percent of total revenues 14.00% 13.00%
Threshold percentage for disclosure 10.00% 10.00%
ScanSource Europe SPRL    
Percent of total revenues 11.00%  
Threshold percentage for disclosure 10.00% 10.00%
Spinal Modulation, Inc.    
Percent of total revenues   13.00%
Threshold percentage for disclosure 10.00% 10.00%