The Company is exposed to the following concentration risk:

The customers who account for 10% or more of the Company's revenue for the year ended December 31, 2023 or 10% or more of the Company's outstanding receivable balance as of December 31, 2023 are presented as follows:


	Year ended December 31, 2023				As of December 31, 2023
Customer	Revenues (millions)		Percentage of revenues		Accounts Receivable (millions)		Percentage of accounts receivable
A	$	0.8	17	%	$	—	—	%
B	$	0.2	4	%	$	0.1	10	%
C	$	0.4	10	%	$	—	—	%
Total	$	1.4	31	%	$	0.1	10	%

The customers who account for 10% or more of the Company's revenue for the year ended December 31, 2022 or 10% or more of the Company's outstanding receivable balance as of December 31, 2022 are presented as follows:


	Year ended December 31, 2022				As of December 31, 2022
Customer	Revenues (millions)		Percentage of revenues		Accounts Receivable (millions)		Percentage of accounts receivable
A	$	0.6	9	%	$	0.2	12	%
B	$	0.2	4	%	$	0.2	18	%
C	$	1.4	23	%	$	0.2	16	%
Total	$	2.2	36	%	$	0.6	46	%

The vendors who account for 10% or more of the Company's purchases for the year ended December 31, 2023 or 10% or more of the Company's outstanding payable balance as of December 31, 2023 are presented as follows:


	Year ended December 31, 2023				As of December 31, 2023
Vendor	Purchases (millions)		Percentage of purchases		Accounts Payable (millions)		Percentage of accounts payable
A	$	2.1	10	%	$	0.4	15	%
B	$	2.7	13	%	$	—	—	%
C	$	1.0	5	%	$	0.5	20	%
Total	$	5.8	28	%	$	0.9	35	%

The vendors who account for 10% or more of the Company's purchases for the year ended December 31, 2022 or 10% or more of the Company's outstanding payable balance as of December 31, 2022 are presented as follows:


	Year ended December 31, 2022				As of December 31, 2022
Vendor	Purchases (millions)		Percentage of purchases		Accounts Payable (millions)		Percentage of accounts payable
A	$	0.2	1	%	$	0.1	12	%
B	$	7.3	31	%	$	—	—	%
C	$	1.4	6	%	$	0.2	31	%
Total	$	8.9	38	%	$	0.3	43	%