Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating Expenses
Impairment of goodwill	$ 1,630		$ 1,630	$ 0
Impairment of other noncurrent assets			32,915	0
Other Income (Expense), Net
Loss before income taxes	(60,481)	$ (20,384)	(84,248)	(43,173)
Income tax benefit	1,689	65	1,718	120
Net loss	$ (58,792)	$ (20,319)	$ (82,530)	$ (43,053)
Net loss per share
Net loss per share, basic (in dollars per share)	$ (0.23)	$ (0.08)	$ (0.33)	$ (0.18)
Net loss per share, diluted (in dollars per share)	$ (0.23)	$ (0.08)	$ (0.33)	$ (0.18)
Weighted average shares outstanding, basic (in shares)	252,366,533	248,003,322	250,803,790	240,307,403
Weighted average shares outstanding, diluted (in shares)	252,366,533	248,003,322	250,803,790	240,307,403
Continuing Operations
Revenues
Total revenues	$ 717	$ 1,767	$ 1,782	$ 3,618
Operating Expenses
Research and development	15,693	11,874	29,942	24,037
Selling, general and administrative	10,306	9,316	20,457	20,954
Impairment of goodwill	1,630	0	1,630	0
Impairment of other noncurrent assets	32,915	0	32,915	0
Total operating expenses	61,558	22,887	87,033	48,215
Operating loss	(60,841)	(21,120)	(85,251)	(44,597)
Other Income (Expense), Net
Interest expense	(2)	(136)	(4)	(460)
Interest income	319	828	927	1,460
Other income, net	43	44	80	424
Total other income, net	360	736	1,003	1,424
Loss before income taxes	(60,481)	(20,384)	(84,248)	(43,173)
Income tax benefit	1,689	65	1,718	120
Continuing Operations | Product revenues
Revenues
Total revenues	31	324	169	648
Continuing Operations | Service revenues
Revenues
Total revenues	673	1,438	1,592	2,965
Operating Expenses
Cost of products and services	1,014	1,697	2,089	3,224
Continuing Operations | Other revenues
Revenues
Total revenues	$ 13	$ 5	$ 21	$ 5