Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net loss	$ (10,221)	$ (13,714)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	1,364	1,721
Amortization of intangible assets	914	1,459
Amortization of loan costs	0	13
Stock-based compensation	6,183	7,363
Non-cash lease (benefit) expense	(83)	418
Deferred income tax expense	5	13
Change in fair value of contingent consideration	0	720
Accretion of available-for-sale investments	(182)	(390)
(Gain) loss on disposal of property and equipment, net	(14)	68
Loss on disposal of assets held for rent, net	198	218
Other	0	(50)
Change in operating assets and liabilities, net of effects of acquisitions
Accounts receivable, trade, net	65	3,612
Inventories	42	(6,425)
Prepaid expenses and other assets	2,392	661
Accounts payable	(1,956)	157
Accrued expenses and other current liabilities	(2,767)	371
Warranty liability	(58)	583
Sales taxes payable	20	510
Other	(377)	(20)
Net cash used in operating activities	(4,475)	(2,712)
Cash flows from investing activities
Purchases of available-for-sale securities	(6,374)	(8,202)
Proceeds from sale of available-for-sale securities	973	524
Maturities of available-for-sale securities	6,000	14,900
Purchases of assets held for rent	(464)	(1,001)
Purchases of property and equipment	(356)	(3,295)
Net cash (used in) provided by investing activities	(221)	2,926
Cash flows from financing activities
Payments on equipment loans	(241)	(127)
Proceeds from exercise of common stock options	0	125
Payments on financed insurance premium	(727)	(569)
Other	16	9
Net cash used in financing activities	(952)	(562)
Net decrease in cash, cash equivalents, and restricted cash	(5,648)	(348)
Cash, cash equivalents, and restricted cash – beginning of period	35,438	19,473
Effects of currency translation on cash, cash equivalents, and restricted cash	(65)	11
Cash, cash equivalents, and restricted cash – end of period	29,725	19,136
Non-cash investing and financing activities
Purchase of property and equipment not yet paid	26	347
Assets acquired under operating leases	0	880
Unrealized gains and losses on currency translation	(6)	0
Unrealized gains and losses on available-for-sale securities	18	(39)
Cash interest paid	$ 445	$ 497