Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities
Net loss	$ (30,940)	$ (23,913)
Adjustments to reconcile net loss to net cash used in operating activities
Settlement of Global Cooling escrow	0	(5,115)
Depreciation	2,816	3,724
Amortization of intangible assets	1,824	2,911
Amortization of loan costs	0	13
Stock-based compensation	14,902	14,220
Non-cash lease (benefit) expense	(139)	28
Deferred income tax expense	5	13
Change in fair value of contingent consideration	0	(198)
Change in fair value of equity investments	4,074	0
Accretion of available-for-sale investments	(318)	(740)
(Gain) loss on disposal of property and equipment, net	(66)	215
Loss on disposal of assets held for rent, net	335	336
Loss on disposal of Global Cooling	8,897	0
Other	0	(53)
Change in operating assets and liabilities, net of effects of acquisitions
Accounts receivable, trade, net	(1,874)	7,091
Inventories	1,807	(4,273)
Prepaid expenses and other assets	2,920	(1,183)
Accounts payable	(766)	(4,681)
Accrued expenses and other current liabilities	(358)	110
Warranty liability	(482)	124
Sales taxes payable	(388)	918
Other	(265)	23
Net cash provided by (used in) operating activities	1,984	(10,430)
Cash flows from investing activities
Purchases of available-for-sale securities	(10,712)	(15,728)
Proceeds from sale of available-for-sale securities	1,790	1,852
Maturities of available-for-sale securities	11,250	32,550
Purchases of assets held for rent	(1,594)	(2,552)
Purchases of property and equipment	(1,351)	(3,904)
Payments on divestiture of Global Cooling	(13,039)	0
Net cash (used in) provided by investing activities	(13,656)	12,218
Cash flows from financing activities
Payments on equipment loans	(468)	(256)
Proceeds from exercises of common stock options	91	306
Payments on financed insurance premium	(1,247)	108
Other	(32)	(16)
Net cash (used in) provided by financing activities	(1,656)	142
Net (decrease) increase in cash, cash equivalents, and restricted cash	(13,328)	1,930
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)	28
Cash, cash equivalents, and restricted cash – end of period	22,045	21,431
Non-cash investing and financing activities
Purchase of property and equipment not yet paid	302	830
Assets acquired under operating leases	309	880
Unrealized gains and losses on currency translation	4	0
Unrealized gains and losses on available-for-sale securities	18	(37)
Cash interest paid	$ 829	$ 935