Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 13,920,000	$ 39,189,000	$ 15,100,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Stock-based compensation	4,022,000	3,009,000	3,602,000
Depreciation and amortization	23,903,000	18,288,000	21,889,000
Loss on disposal of property and equipment	111,000	38,000	34,000
Deferred income tax assets	(10,324,000)	4,992,000	14,168,000
Revaluation of deferred income taxes from U.S. tax reform	0	0	11,806,000
Amortization of deferred loan costs	301,000	191,000	263,000
Loss on modification of debt	0	243,000	0
Impairment of intangible asset	0	0	1,959,000
Net accretion of contingent consideration	915,000	0	0
Gain on disputed mophie purchase price	0	0	(6,967,000)
Right of use asset expenses	2,497,000
Changes in operating assets and liabilities (net of amounts acquired):
Accounts receivable, net	13,693,000	(33,119,000)	(38,093,000)
Inventories	(58,947,000)	(3,405,000)	(906,000)
Prepaid expenses and other current assets	847,000	1,192,000	(1,113,000)
Other assets	500,000	1,805,000	(928,000)
Accounts payable	4,486,000	(18,714,000)	10,677,000
Income taxes receivable (payable)	5,250,000	(3,827,000)	4,866,000
Accrued liabilities	(777,000)	747,000	(4,505,000)
Accrued wages and wage related expenses	(567,000)	990,000	(517,000)
Deferred revenue	0	0	42,000
Sales returns liability	(13,253,000)	13,889,000	3,719,000
Lease liabilities	(2,645,000)
Other	(154,000)	350,000	(1,022,000)
Net cash (used in) provided by operating activities	(16,222,000)	25,858,000	34,074,000
Cash flows from investing activities:
Purchase of property and equipment, net of business acquired	(8,702,000)	(7,243,000)	(5,766,000)
Proceeds from disposal of equipment and land	490,000	25,000	29,000
Net cash used in investing activities	(28,576,000)	(40,020,000)	(5,737,000)
Cash flows from financing activities:
Payment of debt issuance costs	(244,000)	(463,000)	(157,000)
Proceeds from revolving credit facility	330,968,000	358,980,000	434,826,000
Payments on revolving credit facility	(282,191,000)	(336,071,000)	(442,659,000)
Payments on term loan facility	0	(2,084,000)	(6,250,000)
Purchase of treasury stock	(722,000)	(12,096,000)	(1,492,000)
Payment of withholdings tax on restricted stock units	(887,000)	(2,722,000)	(268,000)
Proceeds from issuance of stock under employee stock purchase plan	61,000	54,000	29,000
Net cash provided by (used in) financing activities	46,985,000	5,598,000	(15,971,000)
Effect of foreign currency exchange rates on cash and cash equivalents	(179,000)	(632,000)	1,019,000
Net increase (decrease) in cash and cash equivalents	2,008,000	(9,196,000)	13,385,000
Cash and cash equivalents at beginning of the period	15,793,000	24,989,000	11,604,000
Cash and cash equivalents at end of the period	17,801,000	15,793,000	24,989,000
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	4,587,000	1,674,000	1,776,000
Cash (refunded) paid during the period for income taxes, net	(3,347,000)	9,123,000	(2,174,000)
Cash paid during the period for rent expenses included in the measurement of lease liabilities	3,264,000
Supplemental schedule of noncash investing and financing activities:
Purchase of property and equipment financed through accounts payable	294,000	517,000	492,000
Modification of debt that resulted in payment of existing term loan balance	0	11,991,000	0
Purchase of Gear4 through contingent payments and common stock	3,886,000	9,355,000	0
Purchase of HALO through amounts due to seller, contingent payments and common stock	16,642,000	0	0
Noncash change in lease asset and operating liabilities from remeasurement or termination of existing leases and addition of new leases	2,644,000
BRAVEN
Cash flows from investing activities:
Purchase of BRAVEN and HALO	0	(4,451,000)	0
Gear4
Cash flows from investing activities:
Purchase of BRAVEN and HALO	0	(28,351,000)	0
HALO
Cash flows from investing activities:
Purchase of BRAVEN and HALO	$ (20,364,000)	$ 0	$ 0