Revenue From Contracts With Customers - Summary of Product and Service Revenue Disaggregated by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation Of Revenue [Line Items]
Product and service revenue	$ 6,623	$ 6,782	$ 14,564	$ 12,714
United States
Disaggregation Of Revenue [Line Items]
Product and service revenue	4,097	3,942	8,067	7,380
South Korea
Disaggregation Of Revenue [Line Items]
Product and service revenue	662	1,190	2,096	2,188
Europe
Disaggregation Of Revenue [Line Items]
Product and service revenue	956	921	2,575	1,810
Asia (Excluding South Korea)
Disaggregation Of Revenue [Line Items]
Product and service revenue	771	633	1,551	1,175
Other
Disaggregation Of Revenue [Line Items]
Product and service revenue	$ 137	$ 96	$ 275	$ 161