Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net income (loss)	$ 25,711	$ (15,305)	$ (33,867)
Adjustments to reconcile net income (loss) to net cash flows provided by (used in) operating activities
Depreciation	538	1,846	740
Accretion of debt discount and loan costs	320	11,508	4,138
Amortization of intangible assets	6,981	6,981	5,157
(Recovery from) provision for inventory obsolescence	1,870	197	(56)
Impairment loss on equipment	0	0	78
Stock-based compensation expense	9,595	5,416	5,941
Deferred income taxes	0	0	40
Changes in assets and liabilities, net of effect of acquisition:
Accounts receivable	(9,360)	(25,163)	(4,640)
Inventories	(8,001)	(6,102)	741
Prepaid expenses and other assets	(1,439)	(581)	422
Accounts payable and accrued expenses	(1,234)	32,275	(2,807)
Net cash flows provided by (used in) operating activities	24,981	11,072	(24,113)
Investing activities:
Product acquisitions	0	(30,685)	(1,951)
Acquisitions of equipment	(13)	(79)	(112)
Net cash flows used in investing activities	(13)	(30,764)	(2,063)
Financing activities:
Proceeds from exercise of stock options	3,369	2,321	670
Proceeds from issuance of common stock, less underwriters discount	0	48,000	0
Proceeds from issuance of Series B preferred stock	0	0	50,000
Payment on note payable	0	(67,346)	0
Proceeds from notes payable	20,000	59,987	0
Equity finance costs	0	(410)	(1,417)
Payment of deferred financing fees	(436)	0	(450)
Loss on refinancing of former debt	0	(2,794)	0
Payment on share repurchase	(205)	0	0
Net cash flows provided by financing activities	22,728	39,758	48,803
Net change in cash and cash equivalents	47,696	20,066	22,627
Cash and cash equivalents at beginning of year	63,888	43,822	21,195
Cash and cash equivalents at end of year	111,584	63,888	43,822
Cash paid for interest	6,979	6,809	6,053
Cash paid for income taxes	$ 250	$ 0	0
Non-cash Financing and Investing Activities:
Adjustments to additional paid in capital dividends in excess of retained earnings			12,500
Accrued financing expenses			$ 600