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	$ (23,849)	$ (177,280)
Adjustments to reconcile net loss to net cash used in operating activities:
Goodwill impairment charges	0	99,409
Depreciation and amortization	2,897	6,159
Loss on write-off of construction in progress and right-of-use asset impairment	0	1,423
Stock-based compensation	9,404	21,780
Reduction of revenue related to stock warrant issued to customer	195	0
Amortization of right-of-use asset	1,150	1,112
Interest expense	0	685
Amortization of debt issuance costs and debt discount	0	62
Accretion or amortization on short-term investments	(1,486)	(805)
Change in fair value of warrant liabilities	21	(106)
Inventory write down	737	2,836
Provision (recovery of) for doubtful accounts	(208)	445
Loss from disposal of property and equipment	0	145
Realized gain on available for sale securities	(275)	0
Changes in operating assets and liabilities:
Accounts receivable	6,089	(3,450)
Inventory	1,425	(2,329)
Prepaid expenses and other assets	(1,268)	672
Accounts payable	2,636	5,488
Accrued and other liabilities	(1,758)	(9,218)
Contract liabilities	60	944
Operating lease liability	(1,492)	(984)
Net cash used in operating activities	(5,722)	(53,012)
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of property and equipment	0	168
Purchase of short-term investments	(24,485)	(5,003)
Proceeds from sales of short-term investments	25,398	19,981
Purchases of property and equipment	(1,382)	(1,006)
Cash and cash equivalents acquired in the Velodyne Merger	0	32,137
Net cash (used in) provided by investing activities	(469)	46,277
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options	109	18
Proceeds from the issuance of common stock under at-the-market offering, net of commissions and fees	3,587	0
At-the-market offering costs for the issuance of common stock	(43)	0
Net cash provided by financing activities	3,653	18
Effect of exchange rates on cash and cash equivalents	(170)	(79)
Net decrease in cash, cash equivalents and restricted cash	(2,708)	(6,796)
Cash, cash equivalents and restricted cash at beginning of period	52,633	124,278
Cash, cash equivalents and restricted cash at end of period	49,925	117,482
SUPPLEMENTAL DISCLOSURES OF OPERATING ACTIVITIES:
Cash paid for interest	740	1,383
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Property and equipment purchases included in accounts payable and accrued liabilities	45	258
Common stock shares issued in the Velodyne Merger	0	297,425
Common stock warrants issued in the Velodyne Merger	$ 0	$ 9,177