Revenue From Contracts With Customers - Summary of Product and Service Revenue Disaggregated by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Product and service revenue	$ 29,493	$ 22,781
United States
Disaggregation Of Revenue [Line Items]
Product and service revenue	15,004	11,604
South Korea
Disaggregation Of Revenue [Line Items]
Product and service revenue	4,380	3,077
Europe
Disaggregation Of Revenue [Line Items]
Product and service revenue	5,805	3,588
Asia (Excluding South Korea)
Disaggregation Of Revenue [Line Items]
Product and service revenue	3,855	4,193
Other
Disaggregation Of Revenue [Line Items]
Product and service revenue	$ 449	$ 319