Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net (loss) income	$ (13,714)	$ (7,421)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	1,721	1,653
Amortization of intangible assets	1,459	2,863
Amortization of loan costs	13	0
Stock-based compensation	7,363	5,399
Non-cash lease expense	418	524
Deferred income tax expense (benefit)	13	(599)
Change in fair value of contingent consideration	720	(3,335)
Accretion of investments	(390)	0
Loss on disposal of property and equipment, net	68	18
Loss / (gain) on disposal of assets held for rent, net	218	(96)
Other	(50)	(17)
Change in operating assets and liabilities, net of effects of acquisitions
Accounts receivable, trade, net	3,612	(1,083)
Inventories	(6,425)	(1,855)
Prepaid expenses and other assets	661	(1,213)
Accounts payable	157	(3,231)
Accrued expenses and other current liabilities	371	(1,074)
Warranty liability	583	0
Sales taxes payable	510	1,543
Other	(20)	0
Net cash used in operating activities	(2,712)	(7,924)
Cash flows from investing activities
Purchases of available-for-sale securities	(8,202)	0
Proceeds from sale of available-for-sale securities	524	0
Maturities of available-for-sale securities	14,900	0
Purchases of assets held for rent	(1,001)	(814)
Purchases of property and equipment	(3,295)	(1,456)
Net cash provided by (used in) investing activities	2,926	(2,270)
Cash flows from financing activities
Proceeds from exercise of common stock options	125	257
Fees paid related to issuance of common stock	0	(50)
Other	9	42
Net cash used in financing activities	(562)	(181)
Net decrease in cash, cash equivalents, and restricted cash	(348)	(10,375)
Cash, cash equivalents, and restricted cash – beginning of period	19,473	69,870
Effects of currency translation on cash, cash equivalents, and restricted cash	11	(22)
Cash, cash equivalents, and restricted cash – end of period	19,136	59,473
Non-cash investing and financing activities
Purchase of property and equipment not yet paid	347	13
Equipment acquired under operating leases	880	243
Unrealized gains and losses on available-for-sale securities	(39)	0
Cash interest paid	497	91
Equipment Loans [Member]
Cash flows from financing activities
Payments on loans	(127)	(125)
Financed Insurance Premium [Member]
Cash flows from financing activities
Payments on financed insurance premium	$ (569)	$ (305)