Summary of Significant Accounting Policies - Summary of Revenue by Major Source (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customer	$ 2,336,489	$ 1,008,145
Clinical/Medical Providers [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customer	634,559	387,888
Direct to Patient [Member]
Disaggregation Of Revenue [Line Items]
Total revenue from contracts with customer	$ 1,701,930	$ 620,257