Revenue From Contracts With Customers - Summary of Product and Service Revenue Disaggregated by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Product and service revenue	$ 7,941	$ 5,932
United States
Disaggregation Of Revenue [Line Items]
Product and service revenue	3,970	3,438
South Korea
Disaggregation Of Revenue [Line Items]
Product and service revenue	1,434	998
Europe
Disaggregation Of Revenue [Line Items]
Product and service revenue	1,619	889
Asia (Excluding South Korea)
Disaggregation Of Revenue [Line Items]
Product and service revenue	780	542
Other
Disaggregation Of Revenue [Line Items]
Product and service revenue	$ 138	$ 65

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details