Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net loss	$ 4,966	$ (3,833)
Adjustments to reconcile net loss to net cash flows from operating activities
Depreciation and amortization	21	85
Accretion of debt discount and loan costs	65	634
Amortization of intangible assets	1,781	1,289
Provision for inventory obsolescence	405	149
Stock-based compensation expense	1,520	1,141
Changes in assets and liabilities, net of effect of acquisition:
Accounts receivable	(6,324)	(2,381)
Inventories	(4,096)	(2,002)
Prepaid expenses and other assets	1,169	218
Accounts payable and accrued liabilities	6,920	1,814
Taxes payable	(40)	0
Net cash flows used in operating activities	6,387	(2,886)
Investing activities:
Acquisitions of equipment	0	(79)
Net cash flows used in investing activities	0	(79)
Financing activities:
Proceeds from exercise of stock options	338	472
Net cash flows provided by financing activities	338	472
Net change in cash and cash equivalents	6,725	(2,493)
Cash and cash equivalents at beginning of period	63,888	43,822
Cash and cash equivalents at end of period	70,613	41,329
Cash paid for interest	$ 1,442	$ 1,931