Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 521,922,000	$ 538,231,000	$ 519,495,000
Cost of sales	338,553,000	352,358,000	350,497,000
Gross profit	183,369,000	185,873,000	168,998,000
Operating expenses:
Advertising and marketing	19,183,000	11,994,000	11,101,000
Selling, general and administrative	135,039,000	108,623,000	105,398,000
Gain on disputed mophie purchase price	0	0	(6,967,000)
Transaction costs	1,930,000	1,678,000	725,000
Impairment of intangible asset	0	0	1,959,000
Amortization of long-lived intangibles	17,005,000	11,882,000	12,047,000
Total operating expenses	173,157,000	134,177,000	124,263,000
Income from operations	10,212,000	51,696,000	44,735,000
Other income (expense):
Interest expense	(4,910,000)	(1,684,000)	(2,081,000)
Other income (expense)	565,000	(483,000)	698,000
Total other expense	(4,345,000)	(2,167,000)	(1,383,000)
Income before income taxes	5,867,000	49,529,000	43,352,000
Income tax benefits (provision)	8,053,000	(10,340,000)	(28,252,000)
Net income	$ 13,920,000	$ 39,189,000	$ 15,100,000
Earnings per share attributable to stockholders:
Basic earnings (loss) per share (in usd per share)	$ 0.48	$ 1.40	$ 0.54
Diluted earnings (loss) per share (in usd per share)	$ 0.48	$ 1.38	$ 0.53