Summary of significant accounting policies (Tables)

6 Months Ended

Jun. 30, 2022

Summary of significant accounting policies

Schedule of concentration risk of customers that represent 10% or more of the Company's total revenue and accounts receivable

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Customer A	28.3	%	*		21.7	%	*
Customer B	15.0	%	*		*		*
Customer C	14.0	%	*		*		*
Customer D	*		*		*		13.7	%
Customer E	*		15.9	%	*		*
	57.3	%	15.9	%	21.7	%	13.7	%

* – less than 10%

The following table presents customers that represent 10% or more of the Company’s accounts receivable:

	June 30,		December 31,
	2022		2021
Customer A	20.4	%	19.5	%
Customer B	15.9	%	12.6	%
Customer C	14.1	%	*
Customer F	12.7	%	*
Customer G	*		10.6	%
Customer H	*		10.0	%
	63.1	%	52.7	%

* – less than 10%

Summary of changes in the amount reserved for warranty cost

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Balance, beginning of period	$	595	$	618	$	598	$	637
Warranty provisions		341		—		351		—
Warranty repairs		—		(6)		(13)		(25)
Balance, end of period	$	936	$	612	$	936	$	612

Schedule of disaggregated revenue by nature and geographic location

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Product and service revenue — recurring	$	2,500	$	1,904	$	5,158	$	3,368
Product and service revenue — non-recurring		1,360		3,790		2,862		7,111
Non-commercial revenue — non-recurring		—		436		—		646
Total revenue	$	3,860	$	6,130	$	8,020	$	11,125

The following table presents the Company’s revenue by customer geography (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
United States	$	2,319	$	3,446	$	4,361	$	5,773
Germany		401		636		825		965
Switzerland		609		1,048		1,488		2,090
All other countries		531		1,000		1,346		2,297
Total revenue	$	3,860	$	6,130	$	8,020	$	11,125