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Summary of significant accounting policies (Tables)

9 Months Ended

Sep. 30, 2021

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

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​	​	​	​	​	​	​	​	​	​	​
​	​	Three Months Ended September 30,				​	Nine Months Ended September 30,
​		2021		2020			2021		2020
Customer A		32.1	%	40.8	%		16.4	%	21.2	%
Customer B		*	​	*	​		*	​	17.1	%
Customer C		*	​	*	​		*	​	10.1	%
Customer D	​	11.4	%	*	​	​	*	​	*	​
Customer E	​	*	​	18.8	%	​	*	​	*	​
​		43.5	%	59.6	%		16.4	%	48.4	%

* – less than 10%

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

​

​	​	​	​	​	​
​		September 30,	​	December 31, 2020
​		2021		2020
Customer A	​	21.7	%	41.9	%
Customer D	​	20.2	%	*	​
Customer E		11.1	%	*	​
Customer F		*	​	10.1	%
Customer G		*	​	13.4	%
Customer H		*	​	18.7	%
​		53.0	%	84.1	%

* – less than 10%

The Company relies on third parties for the supply and manufacture of its products as well as third-party logistics providers. In instances where these parties fail to perform their obligations, the Company may be unable to find alternative suppliers to satisfactorily deliver its products to its customers on time, if at all, which could have a material adverse effect on the Company’s operating results, financial condition and cash flows and damage its customer relationships. There are no significant concentrations around a single third-party supplier or manufacturer for the three and nine months ended September 30, 2021 or 2020.

Summary of changes in the amount reserved for warranty cost

​

​	​	​	​	​	​	​	​	​	​	​	​	​
​		Three Months Ended September 30,						Nine Months Ended September 30,
​		2021			2020			2021			2020
Balance, beginning of the period	​	$	612	​	$	757	​	$	637	​	$	848
Warranty repairs	​		—	​		(3)	​		(25)	​		(94)
Balance, end of the year	​	$	612	​	$	754	​	$	612	​	$	754

Schedule of disaggregated revenue by nature and geographic location

​	​	​	​	​	​	​	​	​	​	​	​	​
​		Three Months Ended September 30,						Nine Months Ended September 30,
​		2021			2020			2021			2020
Product and service revenue — recurring	​	$	2,171	​	$	855	​	$	5,539	​	$	2,712
Product and service revenue — non-recurring	​		4,132	​		4,109	​		11,243	​		6,269
Non-commercial revenue — non-recurring	​		596	​		283	​		1,242	​		1,858
Total revenue	​	$	6,899	​	$	5,247	​	$	18,024	​	$	10,839

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

​

​	​	​	​	​	​	​	​	​	​	​	​	​
​		Three Months Ended September 30,						Nine Months Ended September 30,
​		2021			2020			2021			2020
United States	​	$	4,313	​	$	2,067	​	$	10,086	​	$	4,401
Germany	​		298	​		312	​		1,263	​		1,547
Switzerland	​		899	​		2,765	​		2,989	​		3,574
All other countries	​		1,389	​	​	103	​	​	3,686	​	​	1,317
Total revenue	​	$	6,899	​	$	5,247	​	$	18,024	​	$	10,839

​

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