CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net loss	$ (14,144)	$ (55,379)	$ (42,425)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Provision for doubtful accounts	1,619	864	9,586
Depreciation and amortization	10,936	17,634	17,081
Write-off and amortization of debt issuance costs	1,404	1,454	1,800
Share-based compensation expense	2,303	2,868	2,434
Payment-in-kind interest	4,366	1,725	0
Amortization of debt discount	2,800	1,077	0
(Gain) loss on disposal of property and equipment	71	(65)	(96)
Tools and molds disposal	149	972	0
Intangibles impairment	0	9,379	0
Loss on extinguishment of debt	0	13,205	453
Deferred income taxes	(103)	(1,205)	210
Change in fair value of convertible senior notes	2,265	5,112	(2,948)
Change in fair value of preferred stock derivative liability	2,815	353	0
Changes in operating assets and liabilities:
Accounts receivable	14,069	3,472	10,593
Inventory	15,617	(379)	4,552
Prepaid expenses and other assets	20,004	(6,190)	(11,000)
Accounts payable	(20,761)	4,873	9,517
Accrued expenses	(211)	9,601	(12,231)
Reserve for sales returns and allowances	3,743	8,962	11,781
Income taxes payable	(2,626)	2,599	197
Other liabilities	(749)	894	(128)
Total adjustments	57,711	77,205	41,801
Net cash provided by (used in) operating activities	43,567	21,826	(624)
Cash flows from investing activities
Purchases of property and equipment	(8,268)	(9,415)	(11,770)
Proceeds from sale of property and equipment	78	12	128
Net cash used in investing activities	(8,190)	(9,403)	(11,642)
Cash flows from financing activities
Repurchase of common stock for employee tax withholding	(174)	(273)	(85)
Proceeds from loan under the Paycheck Protection Program	6,206	0	0
Net proceeds from credit facility borrowings	0	5,000	7,500
Retirement of convertible senior notes	(1,905)	0	(13,178)
Repayment of credit facility borrowings	0	(12,500)	(5,000)
Debt issuance costs	0	(4,957)	(1,256)
Proceeds from term loan facility	0	0	20,000
Repayment of term loan facility	(15,073)	(20,000)	0
Term loan prepayment penalty	0	(393)	0
Net proceeds from issuance of long term debt	0	27,356	0
Net cash provided by (used in) financing activities	(10,946)	(5,767)	7,981
Net increase (decrease) in cash, cash equivalents and restricted cash	24,431	6,656	(4,285)
Effect of foreign currency translation	1,976	1,425	(2,487)
Cash, cash equivalents and restricted cash, beginning of year	66,286	58,205	64,977
Cash, cash equivalents and restricted cash, end of year	92,693	66,286	58,205
Cash paid during the period for:
Interest	13,216	6,434	9,446
Income taxes, net	$ 3,849	$ 29	$ 2,096