Revenue Recognition - Summary of Disaggregates of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Total Revenue	$ 60,045	$ 37,115	$ 107,213	$ 85,848
Equipment Sales [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	51,600	30,890	90,432	71,765
Part Sales [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	7,265	5,668	14,468	12,836
Installation Services [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	$ 1,180	$ 557	$ 2,313	$ 1,247