CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net loss	$ (8,082)	$ (2,143)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,041	899
Non-cash interest expense	106	73
Stock-based compensation expense	254	312
Paid-in-kind interest		109
Deferred tax liability	(10)	27
Change in fair value of contingent consideration	426	(1,561)
Change in fair value of warrant liability	1,870
Changes in operating assets and liabilities:
Accounts receivable, net	(120)	6,626
Prepaid expenses and other assets	(1,256)	955
Inventories, net	(430)	(907)
Accounts payable	702	(4,679)
Accrued expenses and other liabilities	772	(274)
Deferred revenue	323	(394)
Net cash used in operating activities	(4,404)	(957)
Investing activities
Interest income reinvested in certificates of deposit		(39)
Purchases of property and equipment	(907)	(1,396)
Net cash used in investing activities	(907)	(1,435)
Financing activities
Proceeds from stock option exercises	44	2
Principal payments on capital leases	(48)	(35)
Payments of contingent consideration		(2,627)
Net cash used in financing activities	(4)	(2,660)
Net decrease in cash, cash equivalents, and restricted cash	(5,315)	(5,052)
Cash, cash equivalents, and restricted cash at beginning of year	17,508	12,137
Cash, cash equivalents, and restricted cash at end of year	12,193	7,085
Supplemental disclosures of cash flow information
Cash paid for interest	638	457
Supplemental disclosures of non-cash activities
Purchases of property and equipment included in accounts payable and accrued expenses	884	791
Accretion of dividends on Series B, C, and D Preferred Stock	$ 1,190	$ 1,190