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Major Customers Accounted for at Least 10% of Total Revenues (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Ingram Micro, Inc.
Percent of total revenues	40.00%	29.00%	39.00%	27.00%
Threshold percentage for disclosure	10.00%	10.00%	10.00%	10.00%
BlueStar, Inc.
Percent of total revenues	20.00%	21.00%	17.00%	23.00%
Threshold percentage for disclosure	10.00%	10.00%	10.00%	10.00%
ScanSource, Inc.
Percent of total revenues	10.00%	19.00%	17.00%	16.00%
Threshold percentage for disclosure	10.00%	10.00%	10.00%	10.00%
Spinal Modulation, Inc.
Percent of total revenues				10.00%
Threshold percentage for disclosure	10.00%	10.00%	10.00%	10.00%

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