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Major customers accounted for at least 10% of total revenues (Details)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
BlueStar, Inc.    
Percent of total revenues 25.00% 21.00%
Threshold percentage for disclosure 10.00% 10.00%
Ingram Micro Inc.    
Percent of total revenues 24.00% 25.00%
Threshold percentage for disclosure 10.00% 10.00%
Scansource, Inc.    
Percent of total revenues 13.00% 19.00%
Threshold percentage for disclosure 10.00% 10.00%
Spinal Modulation, Inc.    
Percent of total revenues 13.00%  
Threshold percentage for disclosure 10.00%