Consolidated Statements of Cash Flows - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income (loss)	$ 15,100	$ (15,587)	$ 15,587
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock-based compensation	3,602	3,830	3,893
Excess tax costs (benefits) related to share-based payments	0	(641)	256
Depreciation and amortization	21,889	22,271	12,933
Loss on disposal of property and equipment	34	0	0
Reduction in reserve on note receivable upon foreclosure recovery	0	0	(639)
Deferred income taxes	14,168	(7,972)	(1,162)
Revaluation of deferred income taxes from U.S. tax reform	11,806	0	0
Amortization of deferred loan costs	263	202	60
Impairment of intangible asset	1,959	0	0
(Gain) loss on disputed mophie purchase price	(6,967)	24,317	0
Changes in operating assets and liabilities (net of amounts acquired):
Accounts receivable, net	(38,093)	(11,587)	18,383
Inventories	(906)	(2,198)	2,064
Prepaid expenses and other current assets	(1,113)	422	(651)
Other assets	(928)	(330)	551
Accounts payable	10,677	14,094	(14,635)
Income taxes receivable (payable)	4,866	9,994	(7,366)
Accrued liabilities	(4,505)	2,836	(3,410)
Accrued wages and wage related expenses	(517)	1,819	(356)
Deferred revenue	42	246	(162)
Sales returns liability	3,719	(9,037)	(814)
Other	(1,022)	0	0
Net cash provided by operating activities	34,074	32,679	24,532
Cash flows from investing activities
Purchase of property and equipment (net of business acquired)	(5,766)	(8,633)	(4,910)
Proceeds from disposal of equipment	29	0	0
Purchase of mophie, net of cash acquired	0	(74,743)	0
Net cash used in investing activities	(5,737)	(83,376)	(4,910)
Cash flows from financing activities
Payment of debt issuance costs	(157)	(1,144)	0
Proceeds from revolving credit facility	434,826	336,391	9,871
Payments on revolving credit facility	(442,659)	(305,084)	(9,871)
Proceeds from term loan facility	0	25,000	0
Payments on term loan facility	(6,250)	(4,688)	0
Purchase of treasury stock	(1,492)	(951)	(14,930)
Payment of withholdings tax on restricted stock units	(268)	(630)	(724)
Proceeds from exercise of warrants and options	29	54	207
Excess tax costs (benefits) related to share-based payments	0	641	(256)
Net cash provided by (used in) financing activities	(15,971)	49,589	(15,703)
Effect of foreign currency exchange rates on cash and cash equivalents	1,019	(290)	(378)
Net increase (decrease) in cash and cash equivalents	13,385	(1,398)	3,541
Cash and cash equivalents at beginning of the period	11,604	13,002	9,461
Cash and cash equivalents at end of the period	24,989	11,604	13,002
Supplemental disclosure of cash flow information
Cash paid during the period for interest	1,776	1,497	46
Cash paid (refunded) during the period for taxes, net	(2,174)	(9,521)	18,710
Supplemental schedule of noncash investing and financing activities
Purchase of fixed assets financed through accounts payable	$ 492	758	269
Purchase of mophie financed through accounts payable		$ 12,139
Purchase of patent or intangible assets			1,218
Foreclosure on real property			1,099
Foreclosure on common stock			$ 688
Issued shares of common stock with a fair value			21
Fair value of intangible assets acquired			$ 198