Summary of Accounting Policies - Schedule of Revenue From Contracts With Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	$ 5,786	$ 4,170	$ 14,167	$ 9,764
L D D
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	3,661	2,655	8,463	6,864
RxLAL [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	1,944	1,444	5,264	2,734
Service Warranty Service Contracts And Accessories
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	$ 181	$ 71	$ 440	$ 166