Summary of Significant Accounting Policies - Summary of Revenue by Major Source (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customer	$ 1,926,660	$ 606,619	$ 3,793,395	$ 2,317,034
Clinical/Medical Providers [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customer	612,207	405,914	1,433,276	1,837,667
Direct to Patient [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customer	$ 1,314,453	$ 200,705	$ 2,360,119	$ 479,367