CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net loss	$ (24,051,000)	$ (11,998,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Provision for doubtful accounts	(772,000)	(225,000)
Depreciation and amortization	1,793,000	1,882,000
Payment-in-kind interest	925,000	1,155,000
Amortization of debt discount	719,000	693,000
Amortization of debt issuance costs	351,000	351,000
Share-based compensation expense	382,000	252,000
Gain on disposal of property and equipment	(55,000)	0
Change in fair value of convertible senior notes	9,047,000	(7,675,000)
Change in fair value of preferred stock derivative liability	7,375,000	(2,082,000)
Changes in operating assets and liabilities:
Accounts receivable	23,369,000	53,406,000
Inventory	1,989,000	6,026,000
Prepaid expenses and other assets	(5,196,000)	4,242,000
Accounts payable	(8,735,000)	(38,452,000)
Accrued expenses	(11,071,000)	(17,459,000)
Reserve for sales returns and allowances	(2,609,000)	(6,622,000)
Income taxes payable	(309,000)	(2,239,000)
Other liabilities	(113,000)	(122,000)
Total adjustments	17,090,000	(6,869,000)
Net cash used in operating activities	(6,961,000)	(18,867,000)
Cash flows from investing activities
Purchases of property and equipment	(1,472,000)	(1,585,000)
Proceeds from sale of property and equipment	21,000	0
Net cash used in investing activities	(1,451,000)	(1,585,000)
Cash flows from financing activities
Repurchase of common stock for employee tax withholding	(164,000)	(172,000)
Net cash used in financing activities	(164,000)	(172,000)
Net decrease in cash, cash equivalents and restricted cash	(8,576,000)	(20,624,000)
Effect of foreign currency translation	(58,000)	(1,634,000)
Cash, cash equivalents and restricted cash, beginning of period	92,693,000	66,286,000
Cash, cash equivalents and restricted cash, end of period	84,059,000	44,028,000
Cash paid during the period for:
Income taxes	484,000	2,567,000
Interest	$ 5,118,000	$ 5,642,000