Revenue - Summary of Revenue Disaggregated by Source (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 21,969,241	$ 25,445,373	$ 47,301,055	$ 52,094,414
Services [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	20,229,773	22,767,059	42,985,224	46,821,578
Product Sales and Other [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 1,739,468	$ 2,678,314	$ 4,315,831	$ 5,272,836