Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Reclassifications out of accumulated other comprehensive loss	$ 0	$ 0
Percentage of direct billing channel revenue insures represent	36.00%
Deferred revenue	$ 1,500		$ 4,000
O&P Providers or Third Party Payors [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue recognized	$ 1,131,400	$ 389,500