CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ 6,219	$ 8,682	$ (72,669)	$ (11,078)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Stock-based compensation expense			3,930	3,291
Depreciation and amortization			15,435	18,007
Deferred income tax assets			(762)	(1,666)
Loss on disposal of intangible assets and equipment	0	96	3,683	102
Amortization of deferred loan costs			420	161
Impairment of goodwill	0	0	18,649	0	$ 0
Right of use asset expenses			1,904	1,897
Changes in operating assets and liabilities:
Accounts receivable, net			52,132	20,813
Inventories			65,606	(53,079)
Prepaid expenses and other current assets			(2,519)	1,883
Other assets			249	381
Accounts payable			(27,304)	14,758
Income tax payable			(13,466)	(3,033)
Sales returns liability			(18,305)	(15,751)
Accrued wages and wage related expenses			(110)	1
Accrued liabilities			(6,050)	103
Lease liabilities			(2,307)	(1,913)
Other			(641)	320
Net cash provided by (used in) operating activities			17,875	(24,803)
Cash flows from investing activities:
Purchase of property and equipment			(5,495)	(7,002)
Proceeds from disposal of equipment			0	2
Purchase of HALO, net of cash acquired			0	(20,364)
Net cash used in investing activities			(5,495)	(27,364)
Cash flows from financing activities:
Proceeds from revolving credit facility			106,130	243,140
Payments on revolving credit facility			(125,615)	(190,140)
Proceeds from the paycheck protection program loan			9,444	0
Contingent liability payments for HALO			(3,724)	0
Purchase of treasury stock			0	(722)
Payment of withholding on restricted stock units			(314)	(848)
Payment of debt issuance costs			(257)	(40)
Proceeds from issuance of stock under employee stock purchase plan			39	61
Net cash (used in) provided by financing activities			(14,297)	51,451
Effect of foreign currency exchange rates on cash equivalents			231	(408)
Net decrease in cash and cash equivalents			(1,686)	(1,124)
Cash and cash equivalents at beginning of the period			17,801	15,793	15,793
Cash and cash equivalents at end of the period	16,115	14,669	16,115	14,669	$ 17,801
Supplemental disclosure of cash flow information:
Cash paid during the period for interest			2,953	3,154
Cash paid during the period for income taxes, net			4,107	1,009
Cash paid during the period for rent expenses included in the measurement of lease liabilities			2,749	2,393
Supplemental disclosure of non-cash investing and financing activities:
Purchase of property and equipment financed through accounts payable			246	742
Withholding tax on restricted stock units recorded in accrued wages and wage related expenses	$ 0	$ 39	0	39
Purchase of HALO through amounts due to seller, contingent payments and common stock			0	16,642
Noncash change in lease asset and operating liabilities from reassessment of existing leases and addition of new leases			$ 2,159	$ 2,473