Organization and Summary of Significant Accounting Policies - Sales Return, Waranty, and Other Credits Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales Return and Warranty Liability [Roll Forward]
Balance at beginning of year	$ 28,373	$ 7,849	$ 8,674
Additions charged to sales	90,018	92,868	43,320
Assumed in acquisition of mophie	0	29,584	0
Sales returns & warranty claims charged against reserve	(86,299)	(101,928)	(44,145)
Foreign currency translation loss	97	0	0
Balance at ending of year	$ 32,189	$ 28,373	$ 7,849