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Major customers accounted for at least 10% of total revenues (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Ingram Micro Inc.        
Percent of total revenues 27.00% 33.00% 25.00% 29.00%
Threshold percentage for disclosure 10.00% 10.00% 10.00% 10.00%
BlueStar, Inc.        
Percent of total revenues 21.00% 21.00% 23.00% 21.00%
Threshold percentage for disclosure 10.00% 10.00% 10.00% 10.00%
Scansource, Inc.        
Percent of total revenues 15.00% 21.00% 14.00% 20.00%
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%